Electron pumps :
Electron pumps Examples batteries, generators and solar cells
These convert various forms of energy to electric energy
In an electric circuit :
In an electric circuit Electric energy is transmitted from an electron pump to a resistor or other device that uses electric energy
Circuits :
Circuits The energy delivered to the resistor is equal to the work done by the electron pump.
As a charge moves through a circuit, it gives up its potential energy. The energy released equals the work done to give the charge potential energy
One ampere is a current flow of one coulomb per second
Electric power is found by multiplying voltage by current
Ohm’s Law :
Ohm’s Law States that the current in a circuit varies directly with the applied voltages and inversely with the resistance of the circuit
The current in a circuit can be varied by varying the voltage or by varying the resistance of the circuit