P4 Electric circuits Flashcards
What makes up electricity
electrons
define current
the rate of flow of charge
What is the unit for current
Amps (A)
What is voltage
the amount of energy per charge
What is the unit for voltage
Volts (V)
What does resistance do
slow the current down, resisting the flow of charge
What is resistance measured in
Ohms (Ω)
Define ohms law in a sentence
Voltage and current are directly proportional (r=v/i)
When does more charge pass around a circuit
when a larger current flows
ammeter
bulb
buzzar
cell
diode
LDR
LED
motor
resistor
switch
thermistor
variable resistor
voltmeter
battery
What makes something and ohmic conductor
its current flowing through is directly proportional to the potential difference (voltage) across it
Give an example of an ohmic conductor
a wire
a resistor
describe what a graph of a wire would be like
the voltage and current are directly proportional
Why does resistance change in a filament bulb
because of the heating effect