Calculating – Ohm’s Law Problems
I = current (amperes) amp
V = voltage (volts) V
R = resistance (Ohms) 
Number ______________
Name _______________________________
Hour _____________ Date ______________
1._________________________ What is the current produced by a potential difference of 240 V
through a resistance of 0.2 ?
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2. _________________________ What resistance would produce a current of 120 amps from a 6 V
battery?
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3._________________________ What voltage is necessary to produce a current of 200 amps through
a resistance of 1.0 x 10-3 ?
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4. _________________________What is the current produced by a 9 V battery flowing through a
resistance of 2.0 x 10-3 ?
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5. __________________________ What is the potential difference if a resistance of 25 
produces a current of 250 ams?
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6. __________________________ How many amperes will a 6 V battery send through a 3  circuit?
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7. A light bulb draws 0.5 amps on a 10 V line. (a) What is the resistance of the light bulb? (b) If you
plugged the bulb into a 110 V line, what would the current be? (c) How much additional resistance would
you have to put in series with a bulb in (a) so it will only draw 0.5 amps on the 110 V line?
(a) ______________________________
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(b) ______________________________
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(c) ______________________________
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8. A parallel circuit has four similar lamps, each on its own branch of the circuit. Each lamp draws 1 amp
on a 110 V line. (a) What is the total current used by all four lamps? (b) What is the resistance of each
lamp?
(a) ________________________________
(b) ________________________________
9.__________________________________ A piece of copper wire 300 m long has a resistance of 1
ohm. About how much current is sent through 900 m of copper wire of the same thickness by a 3 V
battery?