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

Question

he 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 1650 W toaster, a 1090 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 and determine whether the breaker will "open" to prevent an accident. PLEASE SHOW ALL OF YOUR WORK FOR BOTH (A) AND (B)!!!! F!@

Explanation / Answer

toaster = 1680 W
iron = 1150 W
microwave = 1210 W

Total = 1680+1150+1210 = 4040 W

voltage, v = 120 volts,

cct-braker = 20 Amps
a.
Equivalent resistance = v^2/4040 = 120^2/4040 =

= 3.5644 ohms >========================< ANSWER

b.
Current = 120/3.5644 = 33.67 Amps >=====< ANSWER

the breaker "open" in this case >==========< ANSWER

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