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Adding components to a parallel circuit

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I can use the rules for current and potential difference in a parallel circuit and explain the effects of adding a component.

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The p.d. across each branch of a parallel circuit is the same as the p.d. across the battery. The current through each branch of a parallel circuit adds up to the current through the battery. Adding a component in a new branch of a parallel circuit reduces the resistance of the circuit. Adding a component to an existing branch of a parallel circuit increases the resistance of the circuit. The p.d. across the terminals of a battery does not change when components are added to a circuit.

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