Physics 236 Worksheet: Chapter 28, Direct Current Circuits
1. Resistors in parallel have the same
a. current.
b. voltage.
c. power.
2. Resistors in series have the same
a. current.
b. voltage.
c. power.
3. A 100 W resistor is in series with a 200 W resistor.
a. The voltage drop is the same across both.
b. The voltage drop across the 100 W resistor is one half the drop across the 200 W.
c. The voltage drop across the 100 W resistor is twice the drop across the 200 W.
4. A 100 W resistor is in parallel with a 200 W resistor.
a. The current is the same in both.
b. The current in the 100 W resistor is one half the current in the 200 W.
c. The current in the 100 W resistor is twice the current in the 200 W.
5. When a battery is discharging the terminal voltage drops. This is because the battery has
a. less EMF while discharging.
b. less charge while delivering current.
c. internal resistance.
6. A battery with an EMF of 12 v and resistance 2 W is being charged by a 50.0 mA current. The terminal voltage is:
a. 11 v
b. 11.9 v
c. 12 v
d. 12.1 v
e. 13 v
7. The time constant of an RC circuit is the time for the charge on the capacitor to fall to
a. 63% of its initial value.
b. 50% of its initial value.
c. 37% of its initial value.
d. zero.
8. The correct usage for meters in an electric circuit is
a. voltmeters in parallel and ammeters in series with the device to be measured.
b. voltmeters in series and ammeters in parallel with the device to be measured.
c. voltmeters and ammeters in parallel with the device to be measured.
d. voltmeters and ammeters in series with the device to be measured.
9. For most accurate results
a. voltmeters and ammeters should have very high resistance.
b. voltmeters and ammeters should have very low resistance.
c. voltmeters should have very high and ammeters very low resistance.
d. voltmeters should have very low and ammeters very high resistance.
Ans: 1-b, 2-a, 3-b, 4-c, 5-c, 6-b, 7-c, 9-a, 9-c