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Published byLindsey Craze Modified about 1 year ago

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Ohm’s Law

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Measuring Current Current is measured in units of amperes (A) In a series circuit, current is the same at all the points In a parallel circuit, current is shared between all the points 2A 1A 2A

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1A What is the current? SERIES CIRCUITPARALLEL CIRCUIT 3A 1A 3A 4A

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Measuring Voltage Voltage – the electrical push that a cell/battery gives to the current Voltage is also known as Potential Difference Voltage is measured in units of volts (V)

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In a series circuit, voltage is shared between all the points In a parallel circuit, voltage is the same at all the points 1.5V 3V Measuring Voltage

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V V 6V 4A A A 3V 6V 4A CurrentVoltage SeriesSameShared ParallelSharedSame What is the current and voltage?

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V V 6V 4A A A A 6V 4A 2A

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Measuring Resistance Resistance – slows down current, adding components to a circuit increases resistance Resistance is measured in units of ohms (Ω) More resistance = Less current = Less light In a series circuit, add up all resistance to get total.

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Electrical Power

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What is the current?

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How much voltage gives 5 amps of current through a 3 Ω light bulb? I = V/R V = (5A) (3Ω) V = 15V

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How much current flows in a circuit with a 1.5 volt battery and three 1 ohm resistances (bulbs) in series? I = V/R I = (1.5V) / (3Ω) I =.5A

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What is the voltage drop across each resistor in the circuit? 9V/3 = 3V In a series circuit, voltage is shared between all the points

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A light bulb with a resistance of 1.5Ω is connected to a 1.5V battery in the circuit. Calculate the power used by the light bulb? P = IVI = V/R I = (1.5V) (1.5Ω) I = 2.25A P = (2.25A) (1.5V) P = 3.375 W

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