Acircuit has a 20-ohm resistor, and a current of 2 amps flows through it. what must be the battery voltage?

Using Ohm's Law:

Voltage = current ( amps) x resistance

Voltage = 2 amps x  20 ohms

Voltage = 40 volts

answer would be letter choice (a),   a ball resting on a shelf. would be another example of potential energy   >   stored energy > not moving.

a ball spinning on a finger   >   kinetic energy > moving energy

a ball rolling on the ground   >   kinetic energy   > moving energy

a   ball flying through the air   > kinetic energy   >   moving energy

hope that                                         : )

option number c is the right answer.