Download Worksheet 8.1: Sample V=IR and P=VI Problems Mr. Grodek

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Worksheet 8.1: Sample V=IR and P=VI Problems
Ohm’s Law
Voltage
V
Mr. Grodek
Scientific Methodology 2015-16
Power
= Current
x
Resistance
=
x
R
x
ohms (Ω)
I
volts (V) = amps (A)
Power
P
=
Voltage
x
Current
=
V
x
I
watts (W) = volts (V)
x
amps (A)
Use Algebra (equation solving) to solve the following problems. SHOW YOUR WORK!
1) If 3 A of current flows through a 50 Ω resistor, what is the voltage across the resistor?
2) If 120 V is applied to a light bulb with a resistance of 240 Ω, what is the current through the bulb?
3) A heater is plugged into a 240-V outlet and draws 6 A of current. What is the resistance of the heater coil?
4) A 1200-watt hair dryer is plugged into a 120-V outlet. How much current does it draw?
5) How much power does a video game adapter/charger use if its labeled DC output is 12 V and 2.5 A?
6) A device consumes 960 W of power while drawing 4 A of current. At what voltage is its source of power?
ANSWER KEY
1) V = I x R = 3 A x 50 Ω = 150 V
2) I = V ÷ R = 120 V ÷ 240 Ω = 0.5 A
3) R = V ÷ I = 240 V ÷ 6 A = 40 Ω
4) I = P ÷ V = 1200 W ÷ 120 V = 10 A
5) P = V x I = 12 V x 2.5 A = 30 W
6) V = P ÷ I = 960 W ÷ 4 A = 240 V
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