You set up a simple circuit by connecting a 50 Ohm resistor to a battery. You ca

Question

You set up a simple circuit by connecting a 50 Ohm resistor to a battery. You cannot quite figure out the battery's voltage from the label, so you measure the current in the circuit and find that it is 39 mA. You want to get a sense of the strength of the average electric field through the resistor, so you measure the resistor's length to be about 1 mm.

Average Electric Field through the resistor's length = 1.95x10^3 V/m  

A) You decide to estimate how much energy is lost to heat over 1 seconds.

How would you determine A)???

Explanation / Answer

Resistace of resistor R = 50

Current in the circuit I = 39 mA = 39 x 10-3 A

Length of resistor L = 1 mm = 10-3 m

Electric Field through the resistor is E = 1.95 x 103 V/m

Energy lost in heat per second is the power loss = I2 R = 0.07605 W

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