Home » Power Calculations » 2 » a The DC input power of a transmitter operating at 12 volt and drawing 500 milliamp would be:   a.   6 watt   b.   12 watt   c.   20 watt   d.   500 watt Your answer "a" is CORRECT! P = E x I = 12 x 0.5 = 6 watts. Next