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Electricity and Circuits Review Sheet
Assigned on March 8, 2017
Electricity and Circuits Unit
1. Which of the following statements are true about an electric circuit? List all that apply.
a. Electrons are the mobile charge carriers in an electric circuit.
b. The path of charge flow from the + to the - terminal of the circuit can consist of nonconductive material.
c. Charge is consumed as it moves through the energy-transforming devices of the external circuit. For instance, the amount
of charge entering a light bulb in a second is less than that which exits the light bulb in a second.
d. A battery is used to power a flashlight circuit. When the battery no longer works, it is because it has run out of charge.
2. Which of the following statements are true about electric power and electric potential energy? List all that apply.
a. Power is the rate at which energy is used by an electric circuit.
b. A kiloWatt•hour is a unit of electric power.
c. A Joule/second is a unit of power.
d. A 60-Watt light bulb would consume 30 Joules of electrical energy in 2 seconds.
e. A 120-Watt light bulb would consume 1200 Joules of electrical energy in 6 seconds.
f. A charge moving through an electric circuit would gain electric potential energy in the internal circuit and lose electric
potential energy in the external circuit.
g. If a 60-Watt light bulb is placed in a 120-Volt circuit, then the current in the light bulb is 2 Amps.
h. Consider two light bulbs with different power ratings. A 60-Watt light bulb has a greater resistance than a 100-Watt light
bulb.
3. If 6 coulombs of charge flow past point 'A' in a circuit in 4 seconds, then ____ coulombs of charge will flow past point 'A' in 8
seconds.
4. The electric circuit shown at the right consists of a battery and three identical light bulbs. Which of the
following statements are true concerning this circuit? List all that apply.
a. The current through point X will be greater than that through point Z.
b. The current through point Z will be greater than that through point Y.
c. The current will be the same through points X, Y and Z.
d. The current through point X will be greater than that through point Y.
e. The current through point Y will be greater than that through point X.
5. Two or more of the following words and phrases mean the same thing. Identify them by listing their letters.
a. Voltage
b. Wattage
c. Electric Potential Difference
d. Rate at which charge flows
e. Electric Pressure
f. Energy
6. For each part of this question, write the form of circuit that applies: series or parallel.
a. Current is the same throughout
b. The total resistance is equal to the sum of the individual resistances.
c. The voltage drop is the same across each resistor.
d. The voltage drop is proportional to the resistance.
e. Adding a resistor decreases the total resistance
f. Adding a resistor increases the total resistance
g. If the current through one resistor goes to zero there is no current in the entire circuit.
h. If the current through one resistor goes to zero, the current through all other resistors remains the same.
i. This form is suitable for house wiring.
7. Four resistors - 2.0-Ohms, 5.0-Ohms, 12-Ohms and 15-Ohms - are placed in series with a 12Volt battery. Determine the current at and voltage drop across each resistor. Do the same
calculation for a circuit with the same resistors in parallel.
8. Calculate the total current and resistance in the circuit to the right as well as the current and
voltage across each resistor in the following circuit. Write your answers in the appropriate
spaces.
9. Use the chart below to determine the
resistances and tolerances of the following
resistors.
a. Red, Black, Black, Gold
b. Blue, Brown, Green, Gold
c. violet, orange, yellow, silver
10. How could a 5Ω, a 9Ω, and a 3Ω resistor be
arranged so that the equivalent resistance of
the circuit is 3.53Ω? Draw the circuit below.
11. Explain what is meant by current, voltage, and resistance. What is the unit for each quantity?
12. What is the correct reading (with units) for each of the following measurements taken with a multimeter?
a.
b.
c.
Answers:
1. A
2. A, C, H
3. 12 coulombs
4. C
5. A, C, and E
6. a. series; b. series; c. parallel; d. series; e. series; f. series; g. series; h. parallel; i. parallel
7.
Series
Resistance (ohms)
Voltage (V)
2
0.7
5
1.75
12
4.2
15
5.25
Current (A)
0.35
0.35
0.35
0.35
Parallel
Resistance (Ohms)
2
5
12
15
Current (A)
6
2.4
1
0.8
Voltage (V)
12
12
12
12
8.
R1
R2
R3
R4
Req = 16 Ω
V (V)
7.5
4.5
4.5
12
24
I (A)
1.5
1.13
0.38
1.5
1.5
9a) 20Ω ± 5%; b) 6,100,000Ω ± 5%; c) 730,000Ω ± 10%
10. the 9Ω and 3Ω resistors are in series, and those two are in parallel with the 5Ω resistor.
11. current: rate of flow of charge. amps.
voltage: the potential energy per charge (the push of electrons). volts.
resistance: the opposition to the flow of charge. ohms.
12. a) 1.5 V; b) 198Ω; c) 0.21A