Question 11
FThe Figure shows a simplified circuit for a hair dryer.
Figure
The potential difference across each branch is 230 V when S1 is closed.
The current in the motor is 0.50 A.
The current in the heating element is 5.0 A when S2 is closed.
a.[2]
Switch S1 is closed and switch S2 is left open.
Explain why the hair dryer blows cold air.
b.[2]
Calculate the power of the heating element.
c.[4]
Both switches are closed.
Calculate the total energy transferred by the hair dryer in 4.0 minutes.
d.[2]
The heating element becomes very hot, but the wires connecting the heating element to the supply stay cool.
Explain why.
10.3 Electrical energy and power Questions
105 exam-style questions on Edexcel GCSE Physics 10.3 Electrical energy and power, covering 10.3.1 The heating effect of an electric current, 10.3.2 Reducing energy transfer in wires, 10.3.3 Advantages and disadvantages of the heating effect, 10.3.4 Energy transferred by an electrical circuit, 10.3.5 Electrical power, and 10.3.6 Energy transfers in domestic devices. Each one has a worked solution and a mark scheme showing where the marks go.