Question

A 12 V, 60 W lamp is connected to 220 V AC via an ideal transformer. Find the primary current.

विकल्प

• 2.7 A

• 3.7 A

• 0.37 A

• 0.27 A

Answer 1

0.27 A

Explanation:

As transformer is ideal.

So, P_output = P_input = 60

I_p V_p = 60

I_p = \[\frac {60}{V_p}\] = \[\frac {60}{220}\] = \[\frac {3}{11}\] = 0.27 A