A device for heating a cup of water in a car connects to the car's battery, which has an emf E = 10.0V and an internal resistance rint = 0.04? . The heating element that is immersed in the cup of water is a resistive coil with resistance R. David wants to experiment with the device, so he connects an ammeter into the circuit and measures 10.5A when the device is connected to the car's battery. From this, he calculates the time to boil a cup of water using the device. If the energy required is 100kJ , how long does it take to boil a cup of water?
If Vab is the potential difference across the resistive coil of resistance R, P is the power input to the coil, E is the energy required to boil a cup of water, and t is the time needed to heat a cup of water using the electric device, which of the following quantities are known in this problem? Some of the quantities shown below are defined in the circuit diagrams in Part A.
a) t
b) R
c) Vab
d) rint
e) E
f) I
g) P
h) E