Potential difference (also known as
voltage) is the amount of energy converted to heat per unit charge passing between two points in the circuit. It is possible to add together potential differences due to conservation of energy.
A battery creates a potential difference across a resistor. This means that work is done when a charge is moved through the resistor.
Alternatively we could state that energy (e.g. thermal) is released when a charge passes through the resistor.
Use quizzes to practise application of theory.
START QUIZ!
The diagram represents a simple circuit (zero internal resistance)
What is the PD between A and B
Since no internal resistance the terminal PD is the same as EMF
The diagram represents a simple circuit (zero internal resistance)
What is the PD from A to D
No PD across ideal wires since they have no resistance.
The diagram represents a simple circuit (zero internal resistance)
What is the PD from D to C
All potential is dropped across the resistor.
The diagram represents a not so simple circuit (batteries have zero internal resistance)
What is the potential at A?
From the earth connection to A there is a 12 V battery.
The diagram represents a not so simple circuit (batteries have zero internal resistance)
What is the potential at B?
No PD from the Earth connection to B
The diagram shows a network of resistors and batteries
What is the potential at C
From 0V must go up 12 V twice.
The diagram shows a network of resistors and batteries.
The potential at D is
There must be an equal pd across each of the two series resistors. One side is at 24 V the other 0 V so the middle is 12 V.
How much of Potential difference have you understood?
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