A step-up transformer operates on a 220-V AC line and supplies a load current of 6 A. The ratio of the primary to secondary turns is 1:12. Find the current in the primary, voltage in the secondary, and output power, given that the efficiency of the transformer is 70%.

Explanation

To solve the problem step-by-step, we will follow these calculations:

### Step 1: Identify the given values
- Primary voltage (\( V_p \)) = 220 V
- Secondary current (\( I_s \)) = 6 A
- Turns ratio (\( \frac{N_p}{N_s} \)) = 1:12
- Efficiency (\( \eta \)) = 70% = 0.70

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