Energy Power And Resistance Flashcards
Diode
A component that allows current through in one direction only. In the correct direction, diodes have a threshold voltage (typically 0.6 V) above which current can flow.
Electromotive force (EMF)
The energy supplied by a source per unit charge passing through the source, measured in volts.
Filament lamp
A component that allows current through in one direction only. In the correct direction, diodes have a threshold voltage (typically 0.6 V) above which current can flow.
Kilowatt hour
A unit of electrical energy. It is usually used to measure domestic power consumption.
Ohm
The unit of resistance
Light dependent resistor
A light sensitive semiconductor whose resistance is usually used to measure domestic power consumption.
Ohmic conductor
A conductor for which the current flow is directly proportional to the potential difference across it, when under constant physical conditions.
Ohm’s law
The current and potential difference through an ohmic conductor held under constant physical conditions are directly proportional, with the constant of proportionality being resistance.
Potential difference
The difference in electrical potential between two points in a circuit. It is also the work done per coulomb to move a charge from the lower potential point to the higher potential point. It is measured in Volts.
Power
The difference in electrical potential between two points in a circuit. It is also the work done per coulomb to move a charge from the lower potential point to the higher potential point. It is measured in Volts.
Resistance
The difference in electrical potential between two points in a circuit. It is also the work done per coulomb to move a charge from the lower potential point to the higher potential point. It is measured in Volts.
Resistivity
A measure of how difficult it is for charge to travel through a material. It is proportional to the object’s resistance and cross-sectional area, and inversely proportional to the object’s length. It is measured in Ohm metres.
Resistor
A device that has a fixed resistance and follows Ohm’s law.
Volt
Unit of potential difference
