The document discusses key concepts in electric circuits including resistance, equivalent resistance, current, and voltage. It defines resistance as the hindrance to the flow of charge and provides methods for calculating equivalent resistance in series and parallel circuits. Current is defined as the rate of flow of charge and its unit is given as the ampere. Voltage is also mentioned but not defined. Examples are given of calculating equivalent resistance in various circuit configurations.

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Unit 2 : Electric and
Magnetism

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Circuit Components

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Resistance
Resistance is the hindrance (obstacle) to
the flow of charge.

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Equivalent resistance
Series Connection

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Find the equivalent resistance

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Equivalent resistance
Parallel Connection

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Find the equivalent resistance
between CD

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Find the equivalent resistance

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Find the equivalent resistance
between AB

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Find the equivalent resistance
between KL

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Find the equivalent resistance
between KL

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Find the equivalent resistance
between KL

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Current
Current is the rate at which charge flows
past a point on a circuit.
It’s unit is ampere

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Voltage