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Equivalent Resistance, Volts, Amps

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Volts and Amps in a Series Circuit In a series circuit, the Amps remain constant throughout the whole circuit Amps = 2A

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Volts and Amps in a Series Circuit However, in a series circuit at each resistor the volts change. When you add up all the voltage at each resistor, you end up getting the total volts going through the circuit. Amps = 2A Volts 2 = 3V Volts 1 = 2V Volts 3 = 2V Volts total = 7V

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Volts and Amps in a Parallel Circuit In a parallel circuit, each line of wire has a different amount of amps. When added the amps together, you get the total amount of amps in the entire circuit. Amps 3 = 1A Amps 2 =.5A Amps 3 =.5A Amps tot = 2A

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Volts and Amps in a Parallel Circuit However, in a parallel circuit if you have a total of 3 volts in the circuit, each resistor will only have 3 volts Amps 3 = 1A Amps 2 =.5A Amps 1 =.5A Volts Total = 3V Volts 1 = 3V Volts 2 = 3V Volts 3 = 3V Amps tot = 2A

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Equivalent or Total Resistance - Req Equivalent Resistance is the TOTAL resistance of a circuit Symbol:Req or R t Units:Ω Ohms Formula: Series: Req = R 1 + R 2 + R 3 + … Parallel:

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5 3 10 Type of circuit:Series Formula:Req = R 1 + R 2 + R 3 R eq = 10 + 5 + 3 R eq = 18 What is the equivalent resistance (Req) of the circuit below?

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30 75 Type of circuit:Series Formula:Req = R 1 + R 2 R eq = 75 +30 R eq = 105 What is the equivalent resistance (Req) of the circuit below?

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Type of circuit:Parallel Formula: What is the equivalent resistance (Req) of the circuit below? 10 Ω 15 Ω 1 ÷ 0.1666 = 6Ω

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Type of circuit:Parallel Formula: What is the equivalent resistance (Req) of the circuit below? 1 ÷ 0.3333 = 3Ω 15 5 15

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KEY POINTS Symbols of circuit parts: Voltmeter, Ammeter, Power Supply, Resistor Two types of circuits (series and parallel) Formula for Req (equivalent resistance) Series – Req = R 1 + R 2 + R 3 Parallel -

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All the Information you need

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Simulations Open up applications for simulation Or go to http://phet.colorado.edu/en/simulat ions/category/physics http://phet.colorado.edu/en/simulat ions/category/physics

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Colour coding on resistors Resistors are coated with ceramic. They have color coded bands to indicate resistance 1 st & 2 nd band first two digits of resistance 3 rd band Number of zeros to add after the first two numbers. I.E. 10 1, or 2, or 3….

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Resistor Example: If you have a resister that is red, orange and yellow Black0 Brown1 Red2 Orange3 Yellow4 Green5 Blue6 Violet7 Gray8 White9 First colour is red, thus first digit is 2 and the second colour is orange, thus the second digit is 3 = 23 The third colour is yellow, and this digit is 4 we therefore find 10 4 = 10000 This resistance would be 10000 X 23 = 230 000

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