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Published byAshlynn Nichols Modified over 8 years ago
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What we will do today: State the function of a supply voltage (from any power source). Carry out experiments to correctly connect both voltmeters and ammeters.
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What does voltage mean? The voltage is a measure of the energy available to move charges around a circuit. It has the unit volt (V). Further explanation: A supply voltage of 1 volt means that 1 joule of energy is supplied to each coulomb of charge.
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Supply Voltage & Current If the supply voltage in a circuit increases then the current also increases. E.g. If the supply voltage to a bulb increases the bulb will get brighter. This is because the flow of charges is increased.
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Position of Ammeter (don’t copy) If we have a circuit with a battery and bulb, how can we determine which way the Ammeter should be placed? How should we set up our circuit?
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Measuring current When measuring current, the ammeter must be set up in series. E.g. beside the component.
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Position of Voltmeter (don’t copy) If we have a circuit with a battery and bulb, how can we determine which way the voltmeter should be placed? How should we set up our circuit?
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Measuring voltage When measuring voltage, the voltmeter must be set up “parallel”. E.g. above or below the component.
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2006 Qu: 8
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What have we learned today? Voltage of a supply is a measure of the energy given to the charges in the circuit. If the supply voltage is increased so is the current. A voltmeter must be set up in parallel in a circuit. An ammeter must be set up in series in a circuit.
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