Download Tutorial 4 (Chapter 20: Electric Circuits (Part 2)) Questions

Brock University
Physics 1P22/1P92
Winter 2015
Dr. D’Agostino
Tutorial 4 (Chapter 20: Electric Circuits (Part 2))
Questions
Purpose: To understand basic concepts involving electric circuits.
Indicate whether each statement is true or false. Then explain briefly.
1. For several resistors connected in series to a battery, the voltage across each resistor is the
same as the voltage of the battery.
2. For several resistors connected in parallel to a battery, the power dissipated in each resistor
is the same as the power output of the battery.
3. For several resistors connected in parallel to a battery, all of the current goes through the
branch with the minimum resistance, and the current in the other branches is zero, because
“electricity takes the path of least resistance.”
4. For several resistors connected in parallel to a battery, the current in each parallel branch of
the circuit is the same.
5. In a series circuit with one battery and several resistances, the electric potential energy of
each electron decreases as it moves through the circuit outside the battery.
6. In a series circuit that contains a battery and two light-bulbs with equal resistance, the bulb
closer to the negative side of the battery is brighter. This happens because some current is
used up in the first light-bulb, so there is not as much left by the time it reaches the second
light bulb.
7. When additional parallel branches are added to a parallel circuit, where each new branch
has some resistance, the overall resistance of the circuit increases, and therefore the overall
current flowing from the battery decreases.
8. Light bulbs connected with a short circuit are brighter because the electricity doesn’t have
as far to go.
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Problems and Sandbox
Purpose: To understand series and parallel circuits, complex circuits, and practice techniques for
solving complex circuits.
1. Determine the current through each resistor.
100 V
20
Ω
10 Ω
30 Ω
30 Ω
2. Determine the current through each resistor.
10 Ω
60 V
6 Ω
20 Ω
10 Ω
10 Ω
10 Ω
20 Ω
6 Ω
10 Ω
3. Determine the current through each resistor.
10 Ω
10 V
10 Ω
10 Ω
10 Ω
10 V
10 Ω
4. You have a large number of 10-Ω and 20-Ω resistors. Use as many of them as you wish to
construct circuits that have exactly the following equivalent resistances.
(a) 40 Ω
(b) 70 Ω
(c) 5 Ω
(d) 2.5 Ω
(e) 15 Ω
(f) 4 Ω
(g) 3.75 Ω
(h) 7.5 Ω
(i) 12.5 Ω
(j) 9.375 Ω
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