The mechanical equivalent of heat is 1 cal = 4.18 J.A heating coil, connected to a 120-V source, develops 60,000 calories in 10 minutes.The current in the coil is:
A)0.83 A
B)2.0 A
C)3.5 A
D)500 A
E)2100 A

Question

Quizplus · Accepted Answer

Firstly, we need to convert the 60,000 calories to joules:
60,000 cal x 4.18 J/cal = 250,800 J
Next, we can use the formula P = IV (power equals current times voltage) to find the current:
P = IV
250,800 J / 600 s = IV
I = 250,800 J / 600 s / 120 V
I = 3.5 A

Therefore, the current in the coil is 3.5 A.

The Mechanical Equivalent of Heat Is 1 Cal = 4