Electrical Energy and Power Concepts

These flashcards cover fundamental electrical concepts including current, voltage, power, and energy calculations relevant to the lecture notes.

Current

The flow of electric charge, typically measured in amperes (A).

Voltage

The electric potential difference between two points, measured in volts (V).

Electrical Energy

The energy carried by electric charges as they move through a circuit.

Power (P)

The rate at which electrical energy is consumed or produced, calculated as P = E/t, measured in watts (W).

kWh

A unit of energy equivalent to one kilowatt (1 kW) used for one hour.

Energy Cost

The total cost of energy consumption, calculated by multiplying kWh used by the cost per kWh.

Efficiency

A measure of how much useful output energy is obtained from the total input energy, expressed as Useful OUT / Total IN.

Power Rating

The amount of power a device consumes, often expressed in kilowatts (kW).

TV Daily Cost

The cost incurred to run a TV, calculated by multiplying the kWh it consumes by the cost per unit.

1 kWh = 30p

Indicates that one kilowatt-hour of energy costs thirty pence.