(a) Define Electric power. An electrial device of resistance R is connected across a source of voltage V and draws a current I. Derive an expression for power in terms of current and resistance.
(b) Tow electric bulbs rated 100W , 220V and 60W, 220V are connected in parallel to an electric mains of 220V . Find the current draw by the bulbs form the mains.

Explanation

### Step-by-Step Solution

#### (a) Definition of Electric Power
Electric power (P) is defined as the rate at which electrical energy is consumed or converted into another form of energy. It can be expressed mathematically as:

\[ P = \frac{W}{t} \]

where:
...