Ohms Law Model(1st)

What is the voltage source for a circuit carrying 2 A of current through a 36 Ω resistor?

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7.2 V
72 V
1.8 V
18 V

How much resistance is needed to draw 17.6 mA from a 12 volt source?

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68 Ω
680 Ω
6.8 kΩ
212 Ω

According to Ohm's Law

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V is directly proportional to I
V is inversely proportional to I
All of the above
V is directly proportional to vI

If 24 V are applied across a resistor and there are 10.9 mA of current, the resistance is

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2.2 kΩ
22 kΩ
220 Ω
220 kΩ

What is the approximate filament resistance of a light bulb if it operates from a 110 V source and 0.6 A of current is flowing?

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183 Ω
6.6 Ω
18.3 Ω
66 Ω

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?

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900 mV
9 V
0 V
18 V

How much resistance is required to limit the current from a 12 V battery to 3.6 mA?

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22 kΩ
33 kΩ
2.2 kΩ
3.3 kΩ

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?

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214 mA
2 mA
21.4 mA
2.2 mA

When there is 12 mA of current through a 1.2 kΩ resistor, the voltage across the resistor is

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1.4 V
14.4 V
10 V
100 V

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

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18 Ω
112 Ω
1.2 Ω
11.2 Ω

If 750 µA is flowing through 11 kΩ of resistance, what is the voltage drop across the resistor?

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82.5 V
8.25 V
14.6 V
146 V

When 12 V are applied across a 68 Ω resistor, the current is

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176 mA
8.16 mA
816 mA
17.6 mA

What is the approximate resistance setting of a rheostat in which 650 mA of current flows with a 150 V source?

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230 Ω
23 Ω
9.7 Ω
97 Ω

The formula for finding resistance when current and voltage are known is R = I/V.

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True
False

A current of 200 µA through a 6.8 kΩ resistor produces a voltage drop of

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34.4 V
13.6 V
340 V
1.36 V

A resistance of 3.3 MO is connected across a 500 V source. The resulting current is approximately

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151 µA
66 mA
660 mA
15.1 µA

Approximately how much current flows through a 3.3 MO resistor across a 30 V source?

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900 µA
9 µA
9000 µA
90 µA

The formula to find I when the values of V and R are known is

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I = V/R
I = VR
V = IR
I = R/V

Four amperes of current are measured through a 24 Ω resistor connected across a voltage source. How much voltage does the source produce?

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96 V
960 V
8 V
9.6 V

What is the approximate resistance of a rheostat if the voltage source is 18 V and the current is 220 mA?

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8.2 kΩ
82 Ω
820 Ω
8.2 Ω

Twelve volts are applied across a resistor. A current of 3 mA is measured. What is the value of the resistor?

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4 kΩ
400 Ω
4.4 Ω
4 Ω

Ohm's law describes how current is related to voltage and resistance.

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True
False

How much current is produced by a voltage of 18 kV across a 15 kΩ resistance?

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1.2 A
12 A
12 mA
120 mA

The ampere is the unit of resistance.

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False
True

How much voltage is needed to produce 2.5 A of current through a 200 Ω resistor?

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80 V
8 V
50 V
500 V

An electric heater draws 3.5 A from a 110 V source. The resistance of the heating element is approximately

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38.5 Ω
3.1 Ω
31 Ω
385 Ω

Approximately how many milli-amperes of current flow through a circuit with a 40 V source and 6.8 kΩ of resistance?

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590 mA
27.2 mA
5.9 mA
59 mA

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.

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4 Ω
2 Ω
40 Ω
20 Ω

If you wish to increase the amount of current in a resistor from 120 mA to 160 mA by changing the 24 V source, what should the new voltage setting be?

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32 V
320 V
3.2 V
8 V

The formula for finding voltage when resistance and current are known is V = I/R.

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False
True

Ohms Law Model(1st) : Question 1 of 30