Question

A coffee-maker (17 Ω) and a toaster (27 Ω) are connected in parallel to the same 110-V outlet in a kitchen. How much total power is supplied to the two appliances when both are turned on?

Answer 1

Here ,

R1 = 17 Ohm

R2 = 27 Ohm

for the resistance in parallel

1/Rp = 1/R1 + 1/R2

1/Rp = 1/17 + 1/27

Rp = 10.43 Ohm

Power supplied = V^2/Rp

Power supplied = 110^2/10.43

Power supplied = 1160 W

the Power supplied when both are turned on is 1160 W