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1. Four identical resistors are connected in parallel. The equivalent resistance of the parallel combination is 4.5-ohms. What is the resistance of each resistor?

2. A 120-V household circuit that contains a 320-W television, a 1.0 x102-W lamp, and a 1350-W heater is connected to a 20.0-A fuse. Will the fuse melt if all three devices are operating simultaneously? Explain.

3. Resistors R1, R2, and R3 have resistances of 37.0-ohm, 22.0-ohm, and 41.0-ohm respectively. R1 and R2are connected in series, and their combination is in parallel with R3. This arrangement is then placed across a 60.0-V battery.

(a.) What is the equivalent resistance of the three resistors?

(b.) What is the current in the circuit?

(c.) What is the current through R3?

(d.) What is the potential difference across R1?

4. A 19-ohm resistor is connected in series to a 45-V battery and two 12-ohm resistors that are connected in parallel to each other.

(a.) What is the equivalent resistance of the three resistors?

(b.) What is the current in the circuit?

(c.) What is the current through one of the 12-ohm resistors?

(d.) What is the potential difference across the 19-ohm resistor?

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