Calculate the power delivered to the resistor.?

Question

A battery of 10 V is connected across a resistor of 40.0

A. 400 W

B. 10 W

C. 2.5 W

D. .25 W

Answer 1

P = E²/R

P = 10²/40 = 2.5 watts, assuming the 40 is in ohms.

Answer 2

C.

Answer 3

Power is given as V^2/R, or voltage squared divided by resistance. So,

10^2 / 40 = 100/40 = 5/2 = 2.5 watts.

Answer 4

C

Answer 5

first we have to measure the current which will pass throught the resistor

formula current = voltage/resistance

           so, current = 10/40 = 0.25 ampere.

        now, we calculate the power in watts

formula wattage = voltage x current

          so, wattage = 10 x 0.25 = 2.5 watts