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Ohm’s Law. 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,

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Presentation on theme: "Ohm’s Law. 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,"— Presentation transcript:

1 Ohm’s Law

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3 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

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

5 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)

6 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

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

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

9 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.

10 Electrical Power

11 What is the current?

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

15 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

16 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

17 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 = W


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