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 closed loop and a power sourcea power sourcea high resistancea closed loop.
We discuss electricity in terms of current, which is  the power dissipated by the circuithow much the circuit opposes the flow of chargethe energy carried per chargethe rate of flow of charge, potential difference, which is  how much the circuit opposes the flow of chargethe energy carried per chargethe power dissipated by the circuitthe rate of flow of charge, and resistance, which is  how much the circuit opposes the flow of chargethe energy carried per chargethe rate of flow of chargethe power dissipated by the circuit.
Current has units of  amps (A)ohms (Ω)watts (W)volts (V). Potential difference has units of  ohms (Ω)watts (W)amps (A)volts (V). Resistance has units of  ohms (Ω)volts (V)watts (W)amps (A).
Components are placed in a circuit and may have different properties depending on current and potential difference.
 A diodeAn LDRAn ohmic conductorA filament bulb has a constant resistance, no matter the current through it or the potential difference across it.
The resistance of  an ohmic conductora filament bulba diodean LDR increases with the current through it, as the component heats up.
 A diodeAn LDRAn ohmic conductorA filament bulb only allows current to flow through in one direction.
The resistance of  a filament bulban ohmic conductoran LDRa diode changes with how much light it is exposed to, whereas in a thermistor, the resistance will decrease as the temperature  dissipateschangesdecreasesincreases. Using a variable resistor, the resistance of a circuit can be changed. A variable resistor is often used to alter the  heat outputvoltagecurrentenergy in a circuit; for instance, in a light dimmer switch. The power of an electrical circuit is the  Joules (J)currentvoltsenergy transferred per second and is measured in watts.
When components are arranged along the same loop of a circuit, they are in  seriesparallelpotentialground; if components are arranged along different loops of the same circuit, they are in  potentialseriesgroundparallel.