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 batterya closed loop and a power sourcea power sourcean alternating current.
We discuss electricity in terms of current, which is  the energy carried around the circuitthe rate of flow of chargethe magnetic field generated around the circuitthe energy carried per charge, 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  the energy carried per chargehow much the circuit opposes the flow of chargethe magnetic field generated around the circuitthe energy carried around the circuit.
Current has units of  coulombs (C)volts (V)joules (J)amps (A). Potential difference has units of  volts (V)amps (A)coulombs (C)joules (J). Resistance has units of  joules (J)amps (A)coulombs (C)ohms (Ω).
Components are placed in a circuit and may have different properties depending on current and potential difference.
 A voltmeterAn ohmic conductorA thermistorA filament bulb has a constant resistance, no matter the current through it or the potential difference across it.
The resistance of  a diodea thermistora voltmetera filament bulb increases with the current through it, as the component heats up.
 A voltmeterA thermistorA diodeAn ohmic conductor only allows current to flow through in one direction.
The resistance of  a voltmeteran LDRa filament bulba thermistor changes with how much light it is exposed to.
When components are arranged along the same loop of a circuit, they are in  resistanceseriesoppositionparallel; if components are arranged along different loops of the same circuit, they are in  seriesresistanceparallelopposition.