Circuits GapFill

Electricity is used for a wide variety of applications, from the computer you're using right now, to lighting, music, cars and industrial processes. For an electrical circuit to function it needs  a power sourcea batteryan alternating currenta closed loop and a power source.
We discuss electricity in terms of current, which is  the energy carried around the circuitthe energy carried per chargethe rate of flow of chargethe magnetic field generated around the circuit, potential difference, which is  the magnetic field generated around the circuitthe energy carried per chargethe energy carried around the circuitthe rate of flow of charge, and resistance, which is  how much the circuit opposes the flow of chargethe energy carried per chargethe energy carried around the circuitthe magnetic field generated around the circuit.
Current has units of  coulombs (C)volts (V)joules (J)amps (A). Potential difference has units of  amps (A)volts (V)coulombs (C)joules (J). Resistance has units of  amps (A)coulombs (C)joules (J)ohms (Ω).
Components are placed in a circuit and may have different properties depending on current and potential difference.
 An ohmic conductorA thermistorA voltmeterA filament bulb has a constant resistance, no matter the current through it or the potential difference across it.
The resistance of  a thermistora filament bulba diodea voltmeter increases with the current through it, as the component heats up.
 An ohmic conductorA diodeA voltmeterA thermistor only allows current to flow through in one direction.
The resistance of  a thermistora filament bulban LDRa voltmeter changes with how much light it is exposed to.
When components are arranged along the same loop of a circuit, they are in  seriesparallelresistanceopposition; if components are arranged along different loops of the same circuit, they are in  seriesoppositionresistanceparallel.