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SACA c201 Electrical Systems Certification Study
Guide
Ground The connection of an electrical circuit to the Earth. Ten rules of electrical safety A set of guidelines to ensure safe practices when working with electricity. Lockout / tag out A safety procedure used to disable machinery or equipment to prevent hazardous energy release. Types of electrical current Direct current (DC) and alternating current (AC). Circuit tester A device used to test the presence of voltage in an electrical circuit. Components of an electrical circuit Power source, load, conductor, and control device. Types of power supplies DC power supply and AC power supply. Schematic symbols Visual representations of electrical components used in electrical schematics. Manual switch operators Toggle switch, push button switch, selector switch, key switch, and rotary switch. Electrical output devices
Lamp, motor, solenoid, buzzer, and relay. Voltage The electrical potential difference between two points in a circuit. Unit of measurement: volts (V). Voltmeter A device used to measure voltage in an electrical circuit. Voltage characteristics in series and parallel circuits In series circuits, voltage adds up. In parallel circuits, voltage is the same across all components. Current The flow of electric charge in a circuit. Unit of measurement: amperes (A). Ammeter A device used to measure current in an electrical circuit. Current characteristics in series and parallel circuits In series circuits, current is the same across all components. In parallel circuits, current adds up. Ohmmeter A device used to measure resistance in an electrical circuit. Resistance characteristics in series and parallel circuits In series circuits, resistance adds up. In parallel circuits, the total resistance is less than the smallest resistance. Continuity The uninterrupted flow of current in an electrical circuit. Metric prefixes used on DMM
Kirchhoff's current law The sum of currents entering a node is equal to the sum of currents leaving the node. Series and parallel current The calculation of total current in series and parallel circuits. Circuit protection Devices used to protect electrical circuits from overcurrent or short circuits. Circuit breakers Automatic switches that protect electrical circuits from overcurrent. Electrical schematics and wiring diagrams Visual representations of electrical circuits and their connections using symbols. Electromagnetism The interaction between electricity and magnetism. Inductance The property of an electrical circuit that opposes changes in current. Unit of measurement: henries (H). Effect of an inductor In a DC circuit, an inductor resists changes in current. In an AC circuit, an inductor causes a phase shift between voltage and current. Total inductance and inductive reactance The calculation of total inductance and inductive reactance in series and parallel circuits. AC circuit with inductors The calculation of total load on an AC circuit with inductors.
Capacitance The ability of a component to store electrical energy in an electric field. Unit of measurement: farads (F). Types of capacitors Electrolytic capacitor, ceramic capacitor, and film capacitor. Discharging a capacitor The process of releasing the stored electrical energy in a capacitor. Testing a capacitor Using a DMM to check the capacitance and integrity of a capacitor. Effect of a capacitor In a DC circuit, a capacitor blocks DC and allows AC to pass. In an AC circuit, a capacitor causes a phase shift between voltage and current. Total capacitance and capacitive reactance The formula for calculating total capacitance in series is: C_T = 1/(1/C1 + 1/C2 + ... + 1/Cn). for connected in parallel, the total capacitance is the sum of the individual capacitances. The formula for calculating total capacitance in parallel is: C_T = C1 + C2 + ... + Cn AC circuit with capacitors The calculation of total load on an AC circuit with capacitors. Time to charge and discharge a capacitor The calculation of the time required for a capacitor to charge or discharge. Functions of capacitors and inductors in an electric power supply
Troubleshooting a transformer The process of identifying and fixing issues with a transformer using a DMM. Sizing a transformer Determining the appropriate size of a transformer based on the voltage and load requirements. Calculating transformer power loss The calculation of power loss in a transformer due to resistance and magnetizing current. Calculating the current load The calculation of the current drawn by a load connected to a transformer. Categories of transformers Power transformers and control transformers. Designing a control transformer circuit Creating a circuit using a control transformer to achieve a specific output voltage. Tap on the secondary of a transformer A connection point on the secondary winding of a transformer that allows for voltage adjustment.
