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186

Calculate the rate at which energy is used up in the circuit illustrated by the diagram

  • A. 0 W
  • B. 2 W
  • C. 4 W
  • D. 8 W
  • E. 16 W
View Answer & Discuss (2) WAEC 1992
187
Which of the following is not a consequence of hydrogen bubbles covering the copper plate of a primary cell?
  • A. Polarization
  • B. Local action
  • C. Formation of hydrogen electrode
  • D. Increase in the resistance of the cell
  • E. Generation of less current by the cell
View Answer & Discuss (6) WAEC 1992
188
Calculate the length of a constantan wire of cross- sectional area 4 π x 10-8m2 and resistivity 1.1 x 10-6 Ω m required to construct a standard resistor of resistance 21 Ω. [Take π = 22/7]
  • A. 0.42m
  • B. 2.40 m
  • C. 6.25 m
  • D. 183.75 m
  • E. 590.00 m
View Answer & Discuss (4) WAEC 1992
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189
In a domestic circuit, electrical appliances and lamps are arranged in parallel across the mains so as to enable the
  • A. same current to flow through the electrical appliances and the lamps
  • B. maximum energy to be consumed at least cost
  • C. same fuse to be used for the electrical appliances and the lamps
  • D. voltage across the appliances not to be affected when the lamps are switched on and off
  • E. heat losses to be minimized
View Answer & Discuss (1) WAEC 1992
190
Calculate the time in which 4.8 kJ of energy would be expended when an electric heater of resistance 1.8 x 103Ω is used on a 240 V mains supply. (Neglect heat losses to the surrounding).
  • A. 150.0s
  • B. 90.0s
  • C. 36.0s
  • D. 20.0s
  • E. 2.7s.
View Answer & Discuss WAEC 1992
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