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Electrical Engineering
Ohms Law
Quiz 1
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Q.1
What is the voltage source for a circuit carrying 2 A of current through a 36 Ω resistor?
1.8 V
18 V
7.2 V
72 V
Q.2
The current through a flashlight bulb is 40 mA and the total battery voltage is 4.5 V. The resistance of the bulb is approximately
112 Ω
11.2 Ω
1.2 Ω
18 Ω
Q.3
The formula to find I when the values of V and R are known is
I = VR
I = R/V
V = IR
I = V/R
Q.4
How much resistance is required to limit the current from a 12 V battery to 3.6 mA?
3.3 kΩ
33 kΩ
2.2 kΩ
22 kΩ
Q.5
A 120 V lamp-dimming circuit is controlled by a rheostat and protected from excessive current by a 3 A fuse. To what minimum resistance value can the rheostat be set without blowing the fuse? Assume a lamp resistance of 20 ohms.
40 Ω
4 Ω
2 Ω
20 Ω
Q.6
When 12 V are applied across a 68 Ω resistor, the current is
816 mA
17.6 mA
176 mA
8.16 mA
Q.7
Twelve volts are applied across a resistor. A current of 3 mA is measured. What is the value of the resistor?
4 Ω
400 Ω
4 kΩ
4.4 Ω
Q.8
A resistor is connected across a 50 V source. What is the current in the resistor if the color code is red, orange and silver?
2 mA
2.2 mA
214 mA
21.4 mA
Q.9
What is the approximate resistance setting of a rheostat in which 650 mA of current flows with a 150 V source?
9.7 Ω
97 Ω
23 Ω
230 Ω
Q.10
If 24 V are applied across a resistor and there are 10.9 mA of current, the resistance is
220 kΩ
22 kΩ
2.2 kΩ
220 Ω
Q.11
Ohm's law describes how current is related to voltage and resistance.
True
False
Q.12
How much resistance is needed to draw 17.6 mA from a 12 volt source?
212 Ω
6.8 kΩ
68 Ω
680 Ω
Q.13
The formula for finding resistance when current and voltage are known is R = I/V.
True
False
Q.14
Approximately how many milli-amperes of current flow through a circuit with a 40 V source and 6.8 kΩ of resistance?
27.2 mA
59 mA
5.9 mA
590 mA
Q.15
If 750 µA is flowing through 11 kΩ of resistance, what is the voltage drop across the resistor?
8.25 V
82.5 V
14.6 V
146 V
Q.16
What is the approximate resistance of a rheostat if the voltage source is 18 V and the current is 220 mA?
8.2 kΩ
820 Ω
8.2 Ω
82 Ω
Q.17
A resistance of 3.3 MO is connected across a 500 V source. The resulting current is approximately
15.1 µA
151 µA
66 mA
660 mA
Q.18
You are measuring the current in a circuit that is operated on an 18 V battery. The ammeter reads 40 mA. Later you notice the current has dropped to 20 mA. How much has the voltage changed?
9 V
900 mV
0 V
18 V
Q.19
The formula for finding voltage when resistance and current are known is V = I/R.
True
False
Q.20
When there is 12 mA of current through a 1.2 kΩ resistor, the voltage across the resistor is
14.4 V
1.4 V
100 V
10 V
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