There are five cells combined in series to form a battery. A light bulb with a resistance of 4 ohms was attached to it and the power was 1.5A when the light bulb was replaced by an electric fan with a resistance of 9 ohms the power was 0.75A. Find the internal resistance of each cell.
KVL and KCL
KVL stands for Kirchhoff voltage law. KVL states that the total voltage drops around the loop in any closed electric circuit is equal to the sum of total voltage drop in the same closed loop.
Sign Convention
Science and technology incorporate some ideas and techniques of their own to understand a system skilfully and easily. These techniques are called conventions. For example: Sign conventions of mirrors are used to understand the phenomenon of reflection and refraction in an easier way.
There are five cells combined in series to form a battery. A light bulb with a resistance of 4 ohms was attached to it and the power was 1.5A when the light bulb was replaced by an electric fan with a resistance of 9 ohms the power was 0.75A. Find the internal resistance of each cell.
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