Edexcel IGCSE Physics 6.20P Transformer power equation
Practise using transformer power equality to calculate input or output current, compare powers and find efficiency from V, I and power data.
- Syllabus
- First assessment 2019
- Course
- Physics 4PH1
Exam points
- state input power = output power for a 100% efficient transformer
- calculate current using VpIp = VsIs, keeping kV, V, kA and A consistent
- find transformer efficiency by comparing useful output power with total input power
6.20P Transformer power equation question 1
Transformers are useful in the transmission of electricity.
Question (a)
(a)
The diagram shows a step-down transformer.
[ 4 ]
Question (i)
(i)
State the formula linking input power and output power for a transformer.
[ 1 ]
Question (ii)
(ii)
The step-down transformer has an input voltage of 275 kV and an output voltage of 230 V.
The transformer has an output current of 95 A.
Calculate the input current to the transformer.
Assume the transformer is 100% efficient.
input current = ............ A
[ 3 ]
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