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Electricity Crash Course
Ohm's law and charge and stuff... yeah, you're gonna need all the help you can get.
Terms in this set (41)
Negatively charged particle that moves around the nucleus of an atom. In a circuit, the 'electricity' in the wires is a flow of electrons.
Carried by particles in atoms. There are positive and negatice charges.
A flow of charge.
A material that lets a current flow through it.
Poor conductors when cold but better conductors when warm.
A material that does not let a current flow through it.
A device that pushes current round a circuit when chemical react inside.
A collection of cells.
A machine that pushes current when its shaft is turned.
Unit of measurement for current.
Device used to measure current.
The direction from positive to negative round the circuit. The opposite direction of electron flow.
Unit of measurement for charge.
Current x Time (seconds)
The energy given to each electron pushed out into the circuit.
Unit of measurement for voltage.
Device used to measure voltage.
Electromotive Force (e.m.f)
The voltage produced inside a battery.
Circuit components connected in a row. They share the voltage, if one component is removed, the circuit is broken.
Circuit components connected on a fork in the circuit. Each has a direct connect to the battery.
Energy Transformed (formula)
Voltage x Charge
The amount of current that is able to flow through a material for each volt.
The unit of measurement for resistance.
Used to reduce the current and keep currents and voltages at levels needed to make parts work.
Used to change resistance.
Voltage = Current x Resistance (V=IR)
Combined Resistance (series)
First resistance + second resistance
Combined Resistance (parallel)
1/parallel = 1/first resistance + 1/second resistance
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)
Goes alternately - and + as electrons are pushed and pulled around the circuit. It is Brown.
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.
Short, thin wire whcih overheats when too much current flows through, and breaks the circuit. Used to regulate current.
Safety wire connected to metal parts to prevent them becoming 'live'. It is Yellow and Green.
The rate at which energy is transformed.
Unit of measurement for power.
Electrical Power (formula)
Voltage x Current
Power (watts) x Time (seconds)
Static Electricity (Electrostatic Charge)
The build up of charge on the surface of objects.
This set is often in folders with...
Electricity and Magnetism
Physics 7th Grade - Unit 12
Comps Study Guide(7th grade physics)
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