An electric kettle taking ` 3 A "at" 210 V` brings `1 L ` of water from ` 20^(@) C to 80^(@) C "in" 10 min`. Find its efficiency.

Explanation

To find the efficiency of the electric kettle, we will follow these steps:

### Step 1: Calculate Input Power
The input power (P_input) can be calculated using the formula:
\[ P_{\text{input}} = V \times I \]
Where:
- \( V = 210 \, \text{V} \) (voltage)
- \( I = 3 \, \text{A} \) (current)
...