Electric Crcuits (OCR)

what is electric current?

it is the flow of charge

what is the unit of current?

Amperes (A)

what is the direction of conventional current?

positive to negative terminal

what is electromotive force?

The electromotive force is the work done in driving a charge around a complete circuit.

what is potential difference?

Potential difference is the work done in driving a charge through a component.

what is resistance?

Resistance is the opposition to current

what is the unit of resistance?

Ohms

what is electrical power?

 Power is the rate of energy transfer

state ohm’s law?

Ohm’s law states that resistance is directly proportional to current when physical conditions such as the temperature are constant.

what is the function of capacitors?

Store electrical energy in an electric field.

what is the function of inductors?

Store energy in a magnetic field.

what is alternating current?

Alternating current constantly changes direction, going back and forth in a circuit.

state kirchoff’s current law

The total current entering a junction equals the total current leaving the junction.

state kirchoffs voltage law

The sum of all voltages around a closed loop equals zero.