A complete circuit contains two parallel-connected devices and a generator for providing the electromotive force. The resistance of the first device is 12 ohms, the resistance of the second device is 4 ohms, and the voltage developed by the generator is 40 V. What is the magnitude of the current flowing through the first device? A. 10 A B. 13.32 A C. 8 A D. 3.33 A

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Biology

Jeter

2 October, 06:58

A complete circuit contains two parallel-connected devices and a generator for providing the electromotive force. The resistance of the first device is 12 ohms, the resistance of the second device is 4 ohms, and the voltage developed by the generator is 40 V. What is the magnitude of the current flowing through the first device? A. 10 A B. 13.32 A C. 8 A D. 3.33 A

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Chapman · Answer 1

The answer is D. 3.33 A

In parallel connected devices, circuits are also placed parallel. It is known that in parallel circuits, total voltage is equal to the voltage of each device.

So, we know that:

Device 1 - R1 = 12 ohms

Device 2 - R2 = 4 ohms

Total voltage - V = 40V = V1 = V2

If V = I * R, for the first device is V1 = I1/R1.

⇒ I1 = V1 : R1

⇒ I1 = 40 V : 12 ohms

⇒ I1 = 3,33 A