Physics 2
Assignment 2S
YUCOR, JONEHSA F.
BSECE II
Answers
1. Negative powers of 10
a. Indicate numbers less than 1
2. 3.9 Mohms is the same as
d. Both b and c
Solution:
3.9 ร 10๎ ๎โ๎๎ = 3.9 ๎ ๎โ๎๎
3900 ๎ ๎โ๎๎ = 3900 ร 10๎ ๎โ๎๎
= 3.9 ๎ ๎โ๎๎
3. A number written in standard form without
any form of powers of 10 notations is said to be
written in
b. Decimal notation
4. The coulomb is a unit of
a. Electric charge
5. In a metal conductor, such as copper wire,
b. Free electrons are the moving charges that
provide current
6. A semiconductor, such as silicon, has an
electron valence of
a. ยฑ4
7. Which of the following statements is true?
b. Voltage can exist without current
8. Conventional current is considered
c. The motion of positive charges in the
opposite direction of electron flow
9. How much charge is accumulated in a
dielectric that is charged by a 4A current for 5
seconds?
b. 20 C
Solution:
๎ = ๎
๎
Q = IT
= (4)(5)
Q= 20C
10. A potentiometer is a
a. Three-terminal device used to vary the
voltage in a circuit
11. Which of the following resistors has the
smallest physical size?
c. Surface-mount
12. Reading from left to right, the colored bands
on a resistor are yellow, violet, brown, and gold.
If the resistor measures 513 ohms with an
ohmmeter, it is
b. Out of tolerance
Solution:
Yellow=4 Violet =7 Brown = 10 Gold = ยฑ5 %
47 x 10 = 470 ohms x ยฑ5 %
= 23.5
Rmin= 470-23.5 Rmax= 470 + 23.5
=446.5 = 493.5
Range = 446.5 โ 493.5
13. How much will it cost to operate a 4 kW air
conditioner for 12 hours if the cost of electricity
is Php7/kwhr?
Solution:
๎๎๎๎๎ = ๎๎๎๎
๎๎๎๎
Work = (power)(time)
= (4)(12)
=48 kwhr
So, 48 kwhr x ๎
๎๎๎ ๎ก = ๎โ๎ข 336.00
a. Php 336.00
14. Which of the following voltage provides the
greatest danger in terms of electric shock?
c. 120 V
15. On a schematic diagram, what does the
chassis ground symbol represent?
c. A common return path for current in one or
more circuits
16. Using electron flow, the polarity of a
resistorโs voltage drop is
d. Both b and c
17. A positive electric pole:
b. Have fewer electrons than the negative pole.
