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A heater is labelled 800w and400v. (a)What does this labelling mean? (b)what is the power of the instrument when it is given a potential difference of 200v?What is the current flowing through it? (c)if the potential difference of 100v is given to the heater,what will the power of the instrument be? |
| a) Heater Power - 800w Voltage - 400v b) Power when potential difference of 200v P given  c) P = VI = 100 × 2 = 200w |
