In a step down chopper using time ratio control, the input voltage is V and duty cycle is a. The load is purely resistive having resistance R. The average and rms load currents are

• A. <img src="/_files/images/electronics-and-communication-engineering/power-electronics/280-321-1.png">
• B. <img src="/_files/images/electronics-and-communication-engineering/power-electronics/280-321-2.png">
• C. <img src="/_files/images/electronics-and-communication-engineering/power-electronics/280-321-3.png">
• D. <img src="/_files/images/electronics-and-communication-engineering/power-electronics/280-321-4.png">