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Ohm's law and charge and stuff... yeah, you're gonna need all the help you can get.
Terms in this set (41)
Electron
Negatively charged particle that moves around the nucleus of an atom. In a circuit, the 'electricity' in the wires is a flow of electrons.
Charge
Carried by particles in atoms. There are positive and negatice charges.
Current
A flow of charge.
Conductor
A material that lets a current flow through it.
Semiconductor
Poor conductors when cold but better conductors when warm.
Insulator
A material that does not let a current flow through it.
Cell
A device that pushes current round a circuit when chemical react inside.
Battery
A collection of cells.
Generator
A machine that pushes current when its shaft is turned.
Ampere (A)
Unit of measurement for current.
Ammeter
Device used to measure current.
Conventional Current
The direction from positive to negative round the circuit. The opposite direction of electron flow.
Coulombs (C)
Unit of measurement for charge.
Charge (formula)
Current x Time (seconds)
Voltage
The energy given to each electron pushed out into the circuit.
Volt (V)
Unit of measurement for voltage.
Voltmeter
Device used to measure voltage.
Electromotive Force (e.m.f)
The voltage produced inside a battery.
Series
Circuit components connected in a row. They share the voltage, if one component is removed, the circuit is broken.
Parallel
Circuit components connected on a fork in the circuit. Each has a direct connect to the battery.
Energy Transformed (formula)
Voltage x Charge
Resistance
The amount of current that is able to flow through a material for each volt.
Ohm (Ω)
The unit of measurement for resistance.
Resistor
Used to reduce the current and keep currents and voltages at levels needed to make parts work.
Variable Resistor
Used to change resistance.
Ohm's Law
Voltage = Current x Resistance (V=IR)
Combined Resistance (series)
First resistance + second resistance
Combined Resistance (parallel)
1/parallel = 1/first resistance + 1/second resistance
Switch
Breaks or connects a circuit by moving two contacts apart or together.
Alternating Current (a.c)
The current from a mains socket that is pushed and pulled forwards and backwards round the circuit.
Direct Current (d.c)
One-way current.
Live Wire
Goes alternately - and + as electrons are pushed and pulled around the circuit. It is Brown.
Neutral Wire
Zero voltage wire that has a current pass through it. It is earthed (buried in the ground) and therefore won't cause a shock. It is Blue.
Fuse
Short, thin wire whcih overheats when too much current flows through, and breaks the circuit. Used to regulate current.
Earth Wire
Safety wire connected to metal parts to prevent them becoming 'live'. It is Yellow and Green.
Power
The rate at which energy is transformed.
Watt (W)
Unit of measurement for power.
Kilowatt (kW)
1000 watts.
Electrical Power (formula)
Voltage x Current
Energy (formula)
Power (watts) x Time (seconds)
Static Electricity (Electrostatic Charge)
The build up of charge on the surface of objects.
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