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Basic Electricity Complete Study Review, Exams of Physics

Howard Community CollegePhysics

Basic Electricity Complete Study Review

Typology: Exams

2025/2026

Available from 03/05/2026

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Basic Electricity Complete Study Review
AC - -Alternating Current
DC - -Direct Current
EMF - -Electromotive Force
Electromotive Force is measured in
_________________. - -Volts
Current is measured in _______________________.
- -Amps
Resistance is measured in ____________________.
- -Ohms
Power is measured in ________________________.
- -Watts
In __________________ current flow theory
electrons flow from negative to positive. - -
Actual
___________________ is the flow of electrons in a
conductor. - -Electricity
In __________________ current flow theory
electrons flow from positive to negative. - -
Conventional
______________ delivers electrical power to its point
of use. - -Current
______________________ electricity flows in only
one direction. - -Direct Current
The highest potential of current flow in conventional
current theory is the ___________ terminal. - -
Positive
The lowest potential of current flow in conventional
current theory is the ___________ terminal. - -
Negative
Any path that allows the electrons to leave the power
supply an return to the power supply is called a -
-Circuit
A _____________ is a common source of DC
current. - -Battery
_____________ current flows alternately in one
direction and then the other. - -AC or
Alternating
The AC electricity produced in the U.S cycles
___________ times per second. - -60
Frequency is measured in _______________. -
-Hertz or Hz
Capacitance is measured in ______________. -
-Farads
A standard household wall outlet has a voltage
supply of __________ volts. - -120 VAC (Volts
Alternating Current)
Most of the electrical power produced in the world is
_________. - -AC
5Mega Ohms is equivalent to how many Ohms? -
-5,000,000
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AC - - Alternating Current DC - - Direct Current EMF - - Electromotive Force Electromotive Force is measured in _________________. - - Volts Current is measured in _______________________.

    • Amps Resistance is measured in ____________________.
    • Ohms Power is measured in ________________________.
    • Watts In __________________ current flow theory electrons flow from negative to positive. - - Actual ___________________ is the flow of electrons in a conductor. - - Electricity In __________________ current flow theory electrons flow from positive to negative. - - Conventional ______________ delivers electrical power to its point of use. - - Current ______________________ electricity flows in only one direction. - - Direct Current The highest potential of current flow in conventional current theory is the ___________ terminal. - - Positive The lowest potential of current flow in conventional current theory is the ___________ terminal. - - Negative Any path that allows the electrons to leave the power supply an return to the power supply is called a -
      • Circuit A _____________ is a common source of DC current. - - Battery _____________ current flows alternately in one direction and then the other. - - AC or Alternating The AC electricity produced in the U.S cycles ___________ times per second. - - 60 Frequency is measured in _______________. -
      • Hertz or Hz Capacitance is measured in ______________. -
      • Farads A standard household wall outlet has a voltage supply of __________ volts. - - 120 VAC (Volts Alternating Current) Most of the electrical power produced in the world is _________. - - AC 5Mega Ohms is equivalent to how many Ohms? -
      • 5,000,

Find the resistance. 13 Volts, 0.7 Amps - - 18.5Ω Find the voltage. Resistance is 17Ω and current is 4.2. - - 71. Find the current. 208 Volts, 14Ω - - 14.85A

    • Resistors in Parallel What is the total resistance? - -. What type of circuit is this? - - Parallel Name this symbol. - - Variable resistor What is the current? - - 14.4 Amps What is the voltage drop across each lamp? (C batteries are 1.5V) - - 1.5V Each light has 20Ω of resistance. What is the total resistance of this circuit. - - 60 Ω A parallel circuit has 3 resistors. R1=10Ω, R2=20Ω, and R3=30Ω. What is the total resistance of the circuit? - - 5.5Ω A battery gives 12 volts to a 17Ω lamp. What voltage will it give to a 20Ω lamp? - - 12 volts An atom gains an electron. What is the atom called now. - - ion What is the amperage draw per phase on a 240 volt 3 - phase 1500 watt motor? - - 3.6 amps per phase My amperage went up. What happened to my resistance? - - It went down. In a 3 phase breaker panel, what phase is the 4th breaker down on the right. - - A In your service van you have 12 gauge wire and 10 gauge wire. Which is the bigger gauge of wire? -
  • 10 gauge You are pulling a new circuit that connects to a 30 amp breaker. What size of wire do you need? -
  • 10 gauge You are pulling a new circuit that connects to a 20 amp breaker. What size of wire do you need? -
  • 12 gauge wire Name the theory. Electrons flow from negative to positive. - - Actual current theory Name the theory. Electrons flow from positive to negative. - - Conventional current theory How do you write 5 volts DC? - - 5V or 5VDC .535V is - - .535 Millivolts How do you write 5 volts AC - - 5VAC SPST stands for - - Single pole single throw A SPST switch reads resistance of 000 while in the

What is the unit of measurement for capacitance? -

  • Farad What is the unit of measurement for inductance? -
  • Henry's Name this formula. - - Series Capacitance A circuit in the US has inductance of 7 henries. What is the Inductive reactance? - - 2637. Start capacitors typically have a _________________ to drain off voltage when it is not being used. - - Bleed Resistor What is the purpose of an inductor? - - To resist changes in current flow What is used to continuously adjust current or phase shift to a motors windings in an effort to optimize the motor's torque and efficiency performance? - - Run capacitor Run capacitors typically have a ____________ case.
    • Metal Start capacitors are used to start some ______________ phase motors. - - single Find the total inductive reactance in a parallel circuit where XL1=940Ω, XL2=231. and XL3=464Ω. -
  • 132.4Ω Capacitive reactance is - - apparent resistance to AC by a capacitor. The most common circuit fault is .... - - an open. Electricity follows the path of ________________. -
  • least resistance A short circuit in a branch of a parallel circuit will -
  • cause an excessive amount of current to flow. Will a parallel circuit operate if one of its branches has an open? - - Yes - but the circuit will operate with reduced current The power relationship on a transformer states that -
  • power in = power out = loss Transformers are usually rated in units called -
  • volt amperes Which type of windings draw heavy current at startup on a motor? - - Start windings Which windings on a single phase motor are pulled out of the circuit by a centrifugal switch after the motor is running? - - Start windings What type of circuit is this? - - Wye If your meter is set to ohms and connected across the main line, what will happen if you disconnect the branch that contains a short? - - Resistance will suddenly rise If you connect a 240 volt heating element up to 208 volts, how much decrease in efficiency will you have?
    • 25%

What does the symbol μ represent? - - micro What is the value of the prefix μ? - - 1/1,000,000th - Micro What is the value of the prefix m? - - 1/1000th - Milli What is the value of the prefix M? - - 1,000,

  • Mega What is the value of the prefix k? - - 1, Who invented the battery? - - Alexandro Volta Who invented AC electricity? - - Nikola Tesla Who was Tesla's rival? - - Thomas Edison - Edison was a proponent of DC current instead of AC current Who is this? - - Thomas Edison - Invented the light bulb Who is this? - - Nikola Tesla - Founder of AC Current Who is this? - - Andre Ampere - Founder of amperage Who is this? - - George Simon Ohm You have an ohmmeter connected across the main line of a parallel circuit. You disconnect one branch and there is no change in ohms. You have discovered the branch with a(n) - - open. It only takes _________________ of an amp to kill you. - - 1/10th To maintain a constant voltage output under varying loads requires a constant voltage ______________. - - Power Supply Material that does not conduct electricity very well. - - Insulator Basic electrical component to open and close a circuit. - - Switch Represents components with standard symbols - - Schematic diagram Manually operated switch where you push a button - - Pushbutton switch Manually operated switch where you select a position and turn the switch knob to it. - - Selector switch Manually operated switch used when visual confirmation of the switch state is needed. - - Knife switch Switch contacts which are opened when acted upon by an operator. - - Normally closed Switch contacts which are closed when acted upon by an operator. - - Normally open Switch contact that incoming power is connected to. - - Common

Circuit Is a commercial buildings lighting systems an example of a combination circuit? - - Yes Is a ceiling fan/lights an example of a series circuit? -

  • No Is an electrical outlet controlled by a switch an example of a series-parallel circuit? - - Yes A short circuit in a ___________ circuit can damage or destroy the power supply. - - Parallel A ______________ in the branch of a parallel circuit can cause a short circuit across the power supply. -
  • Short circuit (T/F) A method of troubleshooting a parallel circuit to find a short is to connect an ohmmeter across the main line with the power turned off. - - True The power relationship on a transformer states that _________________________. - - Power In = Power Out + Loss Transformers are usually rated in units called _____________. - - Volt Amperes The current load of a transformer is the current drawn by the ___________________. - - Primary Winding Commonly used to reduce line voltages of 240VAC or 480VAC to 120VAC - - Control Transformer Transformer with a center tap on the secondary -
  • Distribution Transformer Only has one coil for both primary and secondary -
  • Autotransfomer Device that transforms one AC voltage to another AC voltage - - Transformer How do you troubleshoot a transformer? - - 1. Verify primary coil continuity 2. Verify secondary coil continuity 3. Verify no continuity between primary and secondary coils 4. Verify no continuity between either coil and ground How do you calculate the output voltage of a transformer? - - Divide input voltage by the turns ratio How do you check for a short in a parallel circuit? -
    1. Disconnect the power supply 2. Look for visible signs of damage 3. Connect an ohmmeter across the main line What can a short circuit in a parallel branch cause? -
    1. Excessive current to flow 2. Damage or destruction of the power supply 3. A short circuit across the power supply Transformers operated off the principle of ___________. - - Mutual inductance What does an open in a branch of a parallel circuit cause? - - The rest of the circuit to operate with a reduced current What type of resistor can be adjusted? - - Variable Resistor

Low voltage variable resistor - - Potentiometer High voltage variable resistor - - Rheostat 3 Applications of a variable resistor - - 1. Lighting 2. Volume knob 3. Television controls Circuit that uses resistors to drop source voltage to a lower voltage - - Voltage Divider 3 examples of combination circuits - - 1. Commercial building lighting 2. Switch controlled outlets 3. Ceiling fan controls 3 examples of electromagnetic devices - - 1. Solenoid 2. Relay 3. Motor Coil that opposes any change in current flow - - Inductor