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WorksheetsU12 PL 2 Retake
Total questions: 15
Worksheet time: 37mins
What potential difference is required across an 8.0-Ω resistor to cause 2.0 A to flow through it?
4.0 V
16 V
8.0 V
32 V
A 4000-Ω resistor is connected across a 220-V power source. What current will flow through the resistor?
0.055 A
1.8 A
5.5 A
18 A
A 200-W light bulb is connected across a 100-V dc power supply. What current will flow through this bulb?
0.90 A
0.36 A
0.60 A
2.0 A
A 100-W light bulb is operated by a 110-V dc source. What is the resistance of this bulb?
100 Ω
8.0 × 10-3 Ω
120 Ω
240 Ω
When 5.00 A is flowing through an 10.0-Ω device, how much power is being dissipated in the device?
50.0 W
250 W
500 W
2.50 kW
How much energy does a 100-W light bulb use in 8.0 hours? (1 hr = 3600 s)
288,000 J
2,880,000 J
13 J
800 J
If an oven has a power of 2000 W and the voltage is 230 V what current rating of fuse is required?
3 .5 A
5 .7 A
8.7 A
20.4 A
Calculate the electric power of an electrical appliance in which 10 A of current is flowing through a resistor of 2 ohms.
80 W
200 W
2.5 A
22.5 k W
Remember: V=IR and I=V/R
