Circuits.

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SERIES RESISTOR CIRCUIT. THE EQUIVALENT SERIES RESISTANCE IS : Req = R 1 + R 2 + R 3 THE CURRENT OF THE CIRCUIT IS : I = U / (R 1 + R 2 + R 3 ) THE EQUIVALENT.

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Presentation transcript:

Circuits

Series Circuits Big R = Big DV small R = small DV Current is the same everywhere Voltage gets divided up based on the resistance

Parallel Circuits Current gets divided up amongst the resistors Voltage stays the same

SERIES PARALLEL SERIES

Resistors in Series…just add up Resistors in Parallel…add the reciprocals

Equivalent Resistance Req = 3W + 1.33W +1W +5W = 10.33W These two resistors in parallel can be calculated as one resistor = 1W = 2W = 4W = 3W R2,3 = 1.33W Req = 3W + 1.33W +1W +5W = 10.33W

Resistance and Current in the circuit series Find the Equivalent Resistance and Current in the circuit = 10W parallel = 5W series = 10W I = V/Req = 40.0V/10W = 4A What is the current through the 2.0W resistor? equal resistance…the current divides equally 2A each way

Find the equivalent resistance and current = 40W = 20W = 20W = 40W Find the equivalent resistance and current through the 20W and 8W resistors I = V/Req = 12V/40W = 0.3 A I through 8W resistor = .15 A

What if the resistance is not equal in each resistor? 12V 6W 2W How much current is going through the 2W resistor? Calculate the equivalent resistance… 1/Req = 1/6W + 1/2W = .667W-1 Req = 1.5W Calculate the current in the circuit I = V/Req I = 8A The 6W resistor has 3x the resistance than the 2W, so 3x more current will flow through the 2W resistor… (2W gets ¾, 6W gets ¼)