Physics Electricity Flashcards
For current to flow, there must be…
a closed circuit and a source of potential difference (battery/cell).
Electric current is the rate of…
flow of charge
In series, current is measure with…
Ammeter
In parallel, potential difference is measured using…
Voltmeter
Charge is measured in…
Coulombs
Current is measured in…
Amps
Potential difference is measured in…
Volts
Resistance is measured in…
Ohms
For an ohmic conductor, the current is ___ to the potential difference. This means the current is ____.
1) directly proportional
2) constant
When the resistance of a filament lamp increases the temperature of the lamp…
Increases
For a diode, the current only flows in
____. The diode has a very ____ resistance in the reverse direction
1) one direction
2) high
For a thermistor, as the temperature increases, the resistance…
Decreases
A thermistor is used in a…
Thermostat
For a light-dependent resistor, as light intensity increases, the resistance…
Decreases
In a series circuit, the current is the…
Same through all components
In a parallel circuit the current…
Splits at a junction
In a series circuit, the potential difference is…
Shared between all the components
In a parallel circuit, the potential difference is the…
Same across all branches
In a series circuit, the total resistance is the sum of…
Individual resistances (Rom = R, + R,)
In a parallel circuit, the total resistance is less than the…
Smallest individual resistance
Direct current only flows in…
One direction
Alternating current can…
Change direction
UK mains electricity is an alternating supply with a frequency of ___ Hertz and about ___ Volts.
1) 50 Hz
2) 230 V
