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Published byGeoffrey Porter Modified over 4 years ago

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Electric Circuits and Power Page 706

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Ohm’s Law Resistance is equal to the voltage divided by the current. Resistance = Voltage Current Ohms ( ) = Volts (V) Amps (A) Voltage = Current X Resistance

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Features of a Circuit 1.Circuits have devices (LOAD)` that are run by electrical energy. 2.A circuit has a source of electrical energy. 3.Circuits are connected by conducting wires.

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Series Circuit In a series circuit, there is only one path for the current to take. Advantages – simple to design and build Disadvantages – If one light goes out, they all go out; as more lights are added, they become dimmer.

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Ammeter A device used to measure current.

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Parallel Circuit In a parallel circuit, there are several paths for current to take. Advantages – if there is a break in one branch, charges can still move through the other branches; switches can be added to turn on different parts; as new branches are added, resistance decreases & current increases. Disadvantages – More difficult and complicated to assemble.

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Voltmeter A device used to measure voltage, or electrical potential energy difference.

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Power The rate at which energy is transformed from one form to another. The unit of power is the watt (W).

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Calculating Power Power = Voltage X Current Watts = volts X amperes P=VI Energy = Power X Time

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