The total current delivered to a number of devices connected in parallel is the

Question

The total current delivered to a number of devices connected in parallel is the sum of the individual currents in each device. Circuit breakers are resettable automatic switches that protect against a dangerously large total current by "opening" to stop the current at a specified safe value. A 1600 W toaster, a 1050 W iron, and a 1250 W microwave oven are turned on in a kitchen. As the drawing shows, they are all connected through a 20 A circuit breaker to an ac voltage of 120 V.


(a) Find the equivalent resistance of the three devices.


(b) Obtain the total current delivered by the source.

Explanation / Answer

the total power turned on in the kitchen(P)=1600w+1050w+1250W =3900w connected a.c voltage(V)=120 V current in the circuit (I)=20 A (a) we know that, power (P)=v^2/R R=P/V^2 =3900/(120)^2 =0.27 ohm (b) we know that, power(P)=V.I I=P/V I=3600/120 =30 A

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