Another DC circuits question
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Another DC circuits question

[From: ] [author: ] [Date: 11-05-08] [Hit: ]
Answer in units of A.Im doing online hw and I CANT mess up or else I lose points-Well,So the circuit breaker must be able to handle at least 21 A before it blows.-2400 / 114 = 21.The circuit would need a 30A breaker but the outlets for standard plugs are only rated for 15 or 20A.You wouldneed two 20 A circuits.......
Your toaster oven and coffeemaker each dissi-
pate 1200 W of power. You have a 114 V line
in your kitchen.
For what current must the circuit breaker
be rated for you to operate both of these
appliances at the same time?
Answer in units of A.

I'm doing online hw and I CAN'T mess up or else I lose points

-
Well,
total power dissipated = 2 * 1200 = 2400 W

line voltage = 114 V

Recall that

Power = Volts * amps
amps = Power / Volts = 2400 / 114 = 21 A

So the circuit breaker must be able to handle at least 21 A before it blows.

-
2400 / 114 = 21.05A

The circuit would need a 30A breaker but the outlets for standard plugs are only rated for 15 or 20A. You would need two 20 A circuits.

-
I=P/E
= 2400/114
= ~ 21 amps
use a 25-30 A breaker
1
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