Physics - P2 Tpoic 2 - Controlling and using electric current
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- Created on: 12-03-16 20:45
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- P2 Topic 2 - Controlling and using electric current
- Key terms
- current
- the rate of flow of charge
- voltage
- what pushes the current around the circuit
- resistance
- something that slows the current down
- the balance
- if you increase the voltage, then more current will flow
- potential differance
- voltage = current x time
- current
- Energy transferred
- when electric charge goes through a change (gives up energy) of potential difference
- electrical power = potential difference x current
- energy transferred = current x potential difference x time
- Energy conserved
- junctions
- where the current either splits or rejoins in a parallel circuit
- current doesn't get used up or lost in a circuit
- its conserved
- the total current entering the junction is the same as the total leaving the junction
- its conserved
- junctions
- Resistance
- ammeter
- measures current - must be placed in series
- voltmeter
- measures voltage - must be placed in parallel around the component
- voltage-current graphs
- fixed resistors
- current is proportional to voltage
- filament lamps
- as temperature increases, resistance increases
- diode
- current will only flow in one direction
- fixed resistors
- ammeter
- Devices and reisitance
- light dependent resistor
- in bright light resistance falls
- thermistor
- in hot weather, resistance drops
- resistors
- get hot when an electric current passes through them
- electrons collide with ions in the lattice
- heat causes resistance to increase
- Untitled
- get hot when an electric current passes through them
- light dependent resistor
- Key terms
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