Problem 12-42 Electric power - A

A \(1.10\;kW\) hairdryer and a \(60.0\;W\) light bulb are turned on in the same \(120\;V\; AC\) parallel circuit. Assuming three significant digits in the given voltage, determine the current in the (a) hairdryer (b) light bulb (c) fuse in the circuit. (d) If the fuse is rated at \(15 \;A,\) will it blow?

[Ans. (a) \(9.17\; A\)   (b) \(0.500\; A\)   (c) \(9.67 \;A\)  (d) \(\text{no}\)]

Accumulated Solution

Circuit diagram with a light and hairdryer.


Appliances are connected in parallel in household circuits.
Which relation will give the current through the hair dryer?

(A)  \(\Delta V = IR\)

(B)  \(W = \Delta VI\)

(C)  \(W = \Delta V^2/R\)