Combined Physics - P2 Electricity
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What is the circuit symbol for an open switch?
What is the circuit symbol for a closed switch?
What is the circuit symbol for a cell?
What is the circuit symbol for a battery?
What is the circuit symbol for a diode?
What is the circuit symbol for a resistor?
What is the circuit symbol for a variable resistor?
What is the circuit symbol for an LED?
What is the circuit symbol for a lamp?
What is the circuit symbol for a fuse?
What is the circuit symbol for a voltmeter?
What is the circuit symbol for an ammeter?
What is the circuit symbol for a thermistor?
What is the circuit symbol for an LDR?
What is current?
The rate of flow of charge
What equation links charge flow, current and time?
Charge flow = current x time Q = I t
Describe the IV graph for a resistor at constant temperature.
• Current is directly proportional to potential difference. • Resistance is constant.
What type of circuit is shown in the image?
Series circuit
Explain the shape of the IV graph for a diode.
• Current only flows in one direction through a diode. • There is high resistance in the opposite direction meaning current doesn’t flow.
What equation links potential difference, current and resistance?
Potential difference = current x resistance V = I R
What type of circuit is shown in the image?
Parallel circuit
Draw an I-V graph for a filament lamp.
For a given potential difference, what happens to the current when the resistance increases?
The current decreases.
Explain the shape of the IV graph for a filament lamp.
As the current increases the temperature of the filament lamp increases (so the resistance increases) meaning less current can flow per unit potential difference.