Electric Circuits Answers

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Tommy runs his juicer every morning. The juicer uses 90 W of power and the current supplied is 4.5 A. How many volts are necessary to run the juicer? Ans: 20 V

If a clock expends 2 W of power from a 1.5 V battery, what amount of current is supplying the clock? Ans: 1.3 A

If a blender is plugged into a 110 V outlet that supplies 2.7 A of current, what amount of power is used by the blender?

A light bulb rated as 60 W at 220 V has a potential difference of 110 V across its ends. Find the power dissipated in the light bulb, assuming that the light bulb is ohmic (which it likely isn't). Ans: 15 W

A resistor of resistance 12 Ω has a current of 2.0 a flowing through it. How much energy is generated in the resistor in 1 minute?

The resistance in a fixed length of a wire of circular cross-section is 10.0 Ω. What will be the resistance of a wire of the same length made with the same material but with only half radius? Ans: 40 Ω

The resistivity is 1.68 x 10^-8 Ωm. Calculate the length of a copper wire with diameter 4.00 mm that has a resistance of 5.00 Ω. Ans: 3.74 km.

Calculate the total resistance of two, three, four and five 60 Ω resistors in parallel. What is the simple relationship for the total resistance of equal resistances in parallel?

Find the total resistance in each case:

a. A 16 Ω and an 18 Ω resistor connected in parallel

b. A 20 Ω, 10 Ω and 5 Ω resistor connected in parallel