hi there, i hav few questions: 1. A 12V, 24W tungsten filament bulb is supplied with current from n cells connected in series. Each cell has an emf of 1.5V and internal resistance of 0.25. What is the value of n in order that the bulb runs at its rated power? 2. Three bulbs are rating 40W, 60W, 100W designed to work on 220V mains. Which bulb will burn most brightly if they are connected in SERIES across 220V mains? Repeat the same question when they are connected in PARALLEL across 220V. 3. An electric iron is marked 20 Volts, 500W. what will be The units consumed by it in using it for 24 hours? 4. What is the heat generated by a 40 W bulb in one hour? please someone help me wid these numericals, i wud be highly grateful!