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Ohm's Law
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.
20
2
40
4
20
2
40
4
Answer
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Related Question
Ohm's Law
The formula to find I when the values of V and R are known is
V = IR
I = VR
I = V/R
I = R/V
V = IR
I = VR
I = V/R
I = R/V
Answer
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Ohm's Law
What is the approximate resistance setting of a rheostat in which 650 mA of current flows with a 150 V source?
9.7
230
23
97
9.7
230
23
97
Answer
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Ohm's Law
When 12 V are applied across a 68 resistor, the current is
816 mA
17.6 mA
8.16 mA
176 mA
816 mA
17.6 mA
8.16 mA
176 mA
Answer
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Ohm's Law
Four amperes of current are measured through a 24 resistor connected across a voltage source. How much voltage does the source produce?
960 V
96 V
8 V
9.6 V
960 V
96 V
8 V
9.6 V
Answer
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Ohm's Law
What is the voltage source for a circuit carrying 2 A of current through a 36 resistor?
18 V
1.8 V
72 V
7.2 V
18 V
1.8 V
72 V
7.2 V
Answer
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