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JAMB Physics 2004 Question 48

Question 48

Electrical Energy and Power

Electrical appliances in homes are normally earthed so that

  1. A.both the a.c. and d.c. sources can be used.
  2. B.a person touching the appliances is safe from electric shock.
  3. C.the appliances are maintained at a higher p.d. than the earth.
  4. D.the appliances are maintained at a lower p.d. than the earth.
Show the answer and explanation

Answer: B (a person touching the appliances is safe from electric shock.)

Explanation

If a fault makes the casing live, current runs to earth (and blows the fuse) instead of through the person.