I/GCSE Physics Question Analysis Topic: Chapter 2: Electricity - Energy and Voltage in Circuits (Part 3)
For I/GCSE Physics, you should know:
Now, let's dive into the last part of IGCSE Physics Chapter 2's sub-topic on "Energy and Voltage in Circuits."
Electric current in solid metallic conductors is a flow of negatively charged electrons. The electrons are able to move freely within the metal, and when a potential difference (voltage) is applied across the conductor, the electrons begin to flow, creating an electric current.
Current is conserved at a junction in a circuit. This means that the total current flowing into a junction is equal to the total current flowing out of the junction. The current does not "pile up" or "disappear" at a junction, as it must be conserved.
Voltage across two components connected in parallel is the same. This is because the potential difference across the two components is the same, as they are connected to the same two points in the circuit.
When calculating the currents, voltages, and resistances of two resistive components connected in a series circuit, you can use Ohm's law (V = I × R) and the fact that the current is the same through all components in a series circuit. The total resistance of the circuit is the sum of the individual resistances, and the voltage drops across the components are proportional to their individual resistances.
Voltage is the energy transferred per unit charge passed. The volt (V) is the unit of voltage, and it represents the energy transferred per unit charge (1 V = 1 J/C).
The relationship between energy transferred, charge, and voltage is given by the equation: E = Q × V, where E is the energy transferred, Q is the charge, and V is the voltage.
Work hard for your I/GCSE Physics examination!
End of analysis. Great!
