Finding Equivalent Resistance of Three Devices Connected in Parallel and Total Delivered Current

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 1500 W toaster, a 1030 W iron, and a 1000 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 acvoltage of 120 V.Find the equivalent resistance of the three devices and the total current delivered by the source. Answer in ohms and amps.

Solution Preview

Because
Power P = V*I = V^2/R
For toaster:
resistance R = V^2/P = 120^2/1500 = 9.60 ohm --Answer
current I = P/V = 1500/120 = 12.5 ...

Solution Summary

The solution provides a clear and concise worked method to obtaining the resistances of a microwave, iron and toaster connected in parallel with circuit breakers and ac current.

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See attached file for full problem description.
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In eac