Kirchhoff's Laws in Circuits (OCR A Level Physics)

For the circuit below, state the readings of ammeters A₁, A₂ and A₃.

Answer:

For the circuit below, state the readings of the voltmeters V₁, V₂  and V₃.All the lamps and resistors have the same resistance.

Answer:

The best way to practice these calculations is to understand why you have made a mistake Common mistakes are:

• Thinking the current is the same through every branch in a parallel circuit

• Thinking the voltage is the same through all components in a series circuit

• Not taking into account multiple resistors

• Not calculating the total resistance using the appropriate parallel or series resistance equation

• The sum of the voltages of all the components in a series circuit not adding up to the e.m.f of the supply

• The current into a junction not being equal to the current out of a junction (Kirchhoff's First Law)

Don't be afraid to annotate circuit diagrams to help with this. The more information you have about all the components, the easier it is to calculate values that are missing