1. P2 Topic 2: Controlling and using electric currents
This topic looks at:
How we measure current and voltage
The relationship between voltage, current and resistance
How the resistance of a circuit be changed
How energy is transferred
Draw a simple series circuit with an ammeter in place
Draw a circuit with a voltmeter connected
V = I × R what does this formula mean and what are the units?
HIGHER what is potential difference and what are the units?
P = I × V what does this formula mean and what are the units?
Explain how changing the resistance in a circuit changes the current and how this can be achieved using a variable resistor
Keywords: Current, ammeter, in series, series circuit, parallel circuit, voltmeter
E = I × V × t what does this formula mean and what are the units?
Draw and annotate how current varies with potential difference filament lamps
Draw and annotate how current varies with potential difference diodes
Draw and annotate current varies with potential difference for fixed resistors I V I V I V
Keywords: potential difference, resistance, ohms, filament lamps, diodes, thermistors, LDR’s, power