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2861
In an ac circuit when the supply voltage frequency is equal to the resonant frequency, the current
  • A. leads the supply voltge by 90o
  • B. lags behind the supply voltage by 90o
  • C. leads the supply voltage by 45o
  • D. is in phase with the supply voltage
View Answer & Discuss (1) WAEC 2014
2862
The energy stored in a simple cell is
  • A. electrical
  • B. nuclear
  • C. thermal
  • D. chemical
View Answer & Discuss WAEC 2014
2863

Which of the following conditions occur at resonance in a series RLC circuit? i. Impedance equals resistance ii. Current is maximum iii. Reactance is maximum iv. Current and voltage are 90° out of phase

  • A. i and ii only
  • B. i and iii only
  • C. i, ii and iii only
  • D. i, ii, iii and iv
View Answer & Discuss (7) WAEC 2014
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2864
An electric motor converts
  • A. electrical energy to mechanical energy
  • B. mechanical energy to electrical energy
  • C. mechanical energy to chemical energy
  • D. electrical energy to thermal energy
View Answer & Discuss (1) WAEC 2014
2865
A 15 \(\mu F\) capacitor is connected to a 240V, 50Hz ac. source. Calculate the reactance of the capacitance [\(\pi = 3.142\)]
  • A. 16\(\Omega\)
  • B. 68\(\Omega\)
  • C. 106\(\Omega\)
  • D. 212\(\Omega\)
View Answer & Discuss (1) WAEC 2014
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