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# Physics chapter 22 & 23

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Ch 22,23 Notes

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• ### Physics chapter 22 & 23

1. 1. Chapter 22 & 23Electricity & Circuits
2. 2. Ohm’s Law Ohm’s Law - The resistance does not depend on the voltage or the current flowing through the circuit. ∆V = I R ∆V = Potential difference or Voltage drop = V, volts I = Current = A, amps R = Resistance = Ω, ohms
3. 3. Charge in circuitsq = It Coulomb =C=As or A = C/s Elementary charge 1.6 X 10-19 C
4. 4. Power Power is the rate of doing work. Power is the rate at which energy is transferred. It is measured in Watts. P= ∆E P = Power = W = J/s t P = I ∆V P = I2 R P = (∆V)2 R
5. 5. Measurements Ohmeter measures resistance in ohms (Ω) – Hook up in parallel outside circuit Voltmeter measures voltage in volts (V) – Hook up in parallel with circuit running Ammeter measures current in amps (A) – Hook up in series. Remove a wire in the circuit and place ammeter in its place.
6. 6. Series and Parallel Circuits
7. 7. Series Circuit – one current path The Equivalent Resistance is greater than the largest resistor RT = R1 + R2 + ... The current is the same in each element since there is only one current path IT = I1 = I2 = ... The total voltage is the sum of the individual voltages and should equal the voltage of the battery ∆VT = ∆V1+ ∆V2+...
8. 8. Parallel Circuit – more than one path The Equivalent Resistance is less than the smallest resistor 1/RT = 1/R1 + 1/R2 + … The total current is the sum of the individual currents IT = I1 + I2 + ... The voltage drop is the same across each resistor because they each have a path from the battery ∆VT = ∆V1 = ∆V2 = ...
9. 9. Adding a Resistor to a Circuit Add a resistor in series 1) total resistance increases 2) therefore, current must go down Add a resistor in parallel 1) total resistance decreases 2) therefore, current must go up
10. 10. Solving Series and Parallel Circuits Calculate the total resistance. Calculate each parallel branch resistance then add the remaining series branches. Make simplified equivalent circuit drawings in order to solve the circuits. Calculate the total current Use the total current as the current to the series part of the circuit to calculate its voltage drop. Calculate the parallel voltage drop by subtracting the series drop from the total voltage drop. Use a chart to track what is known/unknown.