The variation of EMF with time for four types of generators is shown in the figures. Which amongst them can be called AC voltage?
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(a) | (b) |
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(c) | (d) |
1. | (a) and (d) |
2. | (a), (b), (c), and (d) |
3. | (a) and (b) |
4. | only (a) |
In a heating arrangement, an alternating current having a peak value of \(28~\mathrm{A}\) is used. To produce the same heat energy, if direct current is used to produce the same amount of heat, then its magnitude will be:
1. | \(14~\mathrm{A}\) | about2. | \(28~\mathrm{A}\) | about
3. | \(20~\mathrm{A}\) | about4. | cannot say |