17.5 CHAPTER 17. ELECTRIC CIRCUITS
A
bbSB C
a. How bright is bulb A compared to B and C?
b. How bright are the bulbs after switch S has been opened?
c. How do the currents in bulbs A and B change when switch S is
opened?
Current in A Current in B(a) decreases increases
(b) decreases decreases
(c) increases increases
(d) increases decreases
7. [IEB 2004/11 HG1] When a currentIis maintained in a conductor for a
time oft, how many electrons with charge e pass any cross-section of the
conductor per second?
a. It
b. It/e
c. Ite
d. e/It
8. If you have a circuit consisting of 4 resistors of equal resistance in series
and the total voltage across all of them is 17 V, what is the voltage across
each of them?
9. If you have a circuit consisting of 4 resistors of equal resistance in parallel
and the total voltage across all of them is 17 V, what is the voltage across
each of them?
10. In a circuit consisting of a battery and 3 resistors in series, what is the
voltage across the first resistor if the voltage across the battery is 12 V and
the voltages across the other two resistors is 3 V and 2 V respectively?
11. There are 3 resistors in parallel with resistances of 3Ω, 4Ωand 11Ω.
What is the total resistance of the parallel combination?
12. The same three resistors as above are now arranged in series, 3Ω, 4Ω
and 11Ω. What is the total resistance of the series combination?
13. The total resistance of two resistors in parallel is 3Ω, the one resistor has
a resistance of 5Ω, what is the resistance of the other resistor?
14. In a series circuit there are 3 resistors with voltages of 2 V, 5 V and 8 V,312 Physics: Electricity and Magnetism