An object with a resistance of 14 ohms has 84 volts applied to it.?

Question

How much electric energy will be needed to
operate this object for 24 hours?

Answer 1

P = IV
I = V/R
Therefore
P = V^2/R

E = Pt.

(Note t needs to be in seconds, unless you're the electric company then it is in hours and energy is expressed as KWH Kilo Watt Hours)

Answer 2

E=IR I=E/R R=E/I

R=Resistance E=Voltage I=Current/Amps

P=IE P=Power/Watts

In this case we need to find the current:

I=14/84 or approx 0.17 Amps
0.17 (84) = 14 watts

You will be drawing a 14 watts for 24 hrs.
or 336 watt hrs. or 0.336 KW