3.4 Heating Effect of Current

• investigate the heating effect of an electric current on substances
• investigate the factors affecting heating by electric current
• solve numerical problems involving electrical energy and electrical power
• outline applications of the heating effect of an electric current in real life situations
• describe safety precautions when using electric current
• appreciate the applications of the heating effect of an electric current in real life

“How is the heating effect of current utilised in real life situations?”

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1. The heating effect of a current
   40 min · 1 practice tasks · quiz
   Explain the heating effect of an electric current.
2. Investigating the heating effect
   40 min · 1 practice tasks · quiz
   Carry out an experiment to illustrate the heating effect.
3. Factors affecting heating
   40 min · 1 practice tasks · quiz
   Investigate the factors that determine the heat produced by a current.
4. Electrical energy
   40 min · 1 practice tasks · quiz
   Use the equation W = V I t for electrical energy.
5. Electrical power
   40 min · 1 practice tasks · quiz
   Use the equation P = V I for electrical power.
6. Power and energy calculations
   40 min · 1 practice tasks · quiz
   Solve numerical problems on electrical power and energy.
7. The cost of electrical energy
   40 min · 1 practice tasks · quiz
   Calculate the cost of electrical energy used by appliances.
8. The electric kettle
   40 min · 1 practice tasks · quiz
   Describe the electric kettle as an application of the heating effect.
9. The electric iron
   40 min · 1 practice tasks · quiz
   Describe the electric iron as an application of the heating effect.
10. The filament bulb
    40 min · 1 practice tasks · quiz
    Describe the filament lamp and energy-efficient alternatives.
11. Electric heaters
    40 min · 1 practice tasks · quiz
    Describe electric heaters and other heating appliances.
12. Electric cooking
    40 min · 1 practice tasks · quiz
    Describe electric cooking appliances.
13. Electric welding
    40 min · 1 practice tasks · quiz
    Describe electric welding as an application of the heating effect.
14. Fuses and circuit breakers
    40 min · 1 practice tasks · quiz
    Describe fuses and circuit breakers as protection for circuits.
15. Plugs and earthing
    40 min · 1 practice tasks · quiz
    Describe the wiring of a three-pin plug and the purpose of earthing.
16. Avoiding electric shock
    40 min · 1 practice tasks · quiz
    Describe safety precautions when using electricity.
17. Efficiency of appliances
    40 min · 1 practice tasks · quiz
    Calculate the efficiency of electrical appliances.
18. Choosing efficient appliances
    40 min · 1 practice tasks · quiz
    Describe how to use electrical appliances efficiently.
19. Innovations using the heating effect
    40 min · 1 practice tasks · quiz
    Describe innovations that use the heating effect of a current.
20. Review of the heating effect
    40 min · 1 practice tasks · quiz
    Review the heating effect, its equations, appliances and safety.