- 1(current)
Q. No.\(150\) cc of water taken in an electric kettle boils in \(20\) minutes. If the same amount of water is to be boiled in \(10\) minutes, the length of the heating element will have to be:
| 1. | one fourth | 2. | one third |
| 3. | two times | 4. | one half |
Subtopic: Â Heating Effects of Current |
From NCERT
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A cell with an EMF \(E\) and internal resistance \(r\) drives a current \(i\) through an external resistance \(R.\) The following statements describe the power and heat dissipation in the circuit:
| (A) | The cell supplies power equal to \(Ei.\) |
| (B) | Heat is produced in \(R\) at the rate of \(Ei.\) |
| (C) | Heat is produced in \(R\) at the rate of \(E i\bigg({\large\frac{R}{R+r}}\bigg).\) |
| (D) | Heat is produced in the cell at the rate of \(E i\bigg({\large\frac{r}{R+r}}\bigg).\) |
Choose the correct option from the options given below:
| 1. | (A), (B) and (C) only |
| 2. | (A) and (B) only |
| 3. | (A) and (D) only |
| 4. | (A), (C) and (D) only |
Subtopic: Â Heating Effects of Current |
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From NCERT
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- 1(current)
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