P2 Electricity - Keywords and definitions ST+SP.
Terms in this set (45)
Electrical current that repeatedly reverses its direction, like mains electricity.
Instrument that measures electrical current in amperes. Connected in series.
Unit of current. The charge that flows during one second.
An electrical device with a specific function; cooker, washing machine, T.V. Commonly uses mains electricity.
Pull together. (Two unlike (opposite) charges attract).
More than one cell.
A component which changes chemical potential energy to electrical energy. Makes d.c.
Fundamental property of matter that produces all electrical effects. Measured in Coulombs.
A material which allows electrical current to flow through it easily (it has a low resistance).
Movement of positive charge that is imagined to move from the positive terminal to the negative terminal of a battery. Equivalent in effect to the actual, real flow of negative charge (electrons) in the opposite direction.
Unit of electric charge
Flow of electric charge. The number of coulombs of charge that flow per second. Measured in Amps.
Device that only lets electricity flow through it one way
Current that always flows in the same direction.
When an appliance has a casing that is an insulator (usually plastic).
Negatively charged particles with a negligible mass that form the outer portion of all atoms. Flows in a circuit to make a current.
A very thin piece of tungsten wire inside a lamp. Gets very hot when a current passes through it and glows white hot
A component made of a thin wire that protects a circuit from electrical fire. If the current gets too large, the fuse wire melts (the fuse "blows"), breaks the circuit and stops the current.
A component made from a coil of wires. Used to transfer electrical energy to heat energy
A material which does not allow electrical current to flow through it (it has very high resistance).
Light Dependent Resistor. Light = low resistance; dark = high resistance
Light Emitting Diode. A component which gives out light when current flows the right way through it.
Component which changes electrical energy into light energy
The domestic electricity supply. In Thailand it is 220V, 50Hz, a.c.
Unit of resistance
The current flowing through a component is proportional to the potential difference between its ends, providing temperature is constant.
Describes a circuit in which the current splits up into more than one path.
Describes which parts of an electrical circuit are positive and negative
The energy transferred from one coulomb of charge between two points. Measured in volts. Often called the 'voltage'.
Amount of electrical energy transferred every second. The energy can be transferred from somewhere (e.g. a power station) or to somewhere (e.g. an electric kettle). P = V x I
Residual Current Device. A device which switches off a circuit if the current in the live wire is different to the current in the neutral wire. Can protect against electrical shock
Circuit used to change alternating current into direct current
Push away. (Two like (same) charges repel).
Property of an electrical conductor that limits how easily an electric current flows through it. Measured in ohms.
A component which limits the flow of current in a circuit by converting electrical energy into heat energy
A circuit in which the current travels along one path through every component.
Unwanted branch of an electrical circuit that bypasses other parts of the circuit and causes a large current to flow.
The wall outlet for mains electricity that a plug plugs into
A component in a circuit. When closed the current can flow. When open the current can not flow.
A resistor that's resistance depends on temperature. Hot = low resistance; cold = high resistance
Component with a resistance that can be manually changed
Unit of voltage. The energy carried by one coulomb of electric charge,
Defined as the amount of energy transferred to each coulomb of charge that passes. Measured in volts. Sometimes called the 'potential difference'.
A device which is used to measure the voltage across a component. Connected in parallel with the component.
Unit of power. One watt is equal to one joule transferred every second,
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