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Ohm’s law

V. I. R. Ohm’s law. -. +. Voltage ( V ). Definition: what pushes charges Unit: volt (V) Measured by putting voltmeter in parallel. -. +. Current ( I ). Definition: moving electrical charge Unit: ampere (A)  sometimes called Amps Measured by putting ammeter in series.

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Ohm’s law

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  1. V I R Ohm’s law

  2. - + Voltage (V) Definition: what pushes charges Unit: volt (V) Measured by putting voltmeter in parallel.

  3. - + Current (I) Definition: moving electrical charge Unit: ampere (A)  sometimes called Amps Measured by putting ammeter in series. Why?  So the current has to run through the meter.

  4. Resistance (R) Definition: how hard it is for charges to move Unit: ohm (Ω) Measured by putting multimeter in parallel. Disconnect all batteries. The multimeter shows the resistance between the two points you touch.

  5. V I R Ohm’s Law: V = IR What is the equation for V? V = ? IR I = ? R = ?

  6. V I R Ohm’s Law: V = IR What is the equation for I? V = ? IR V R I = ? R = ?

  7. V I R Ohm’s Law: V = IR What is the equation for R? V = ? IR V R I = V I R = ?

  8. - - + + Resistors in Series What is the resistance of the circuit? We can replace RA and RB with an equivalent resistor, Requivalent. = RB RA Requivalent Requivalent = RA+ RB

  9. - - + + Resistors in SeriesExample = 30 Ω 20 Ω Requivalent = 50 Ω Requivalent Requivalent = RA+ RB = 30Ω + 20Ω = 50Ω

  10. - - + + Resistors in Parallel RA In parallel circuits we can also replace RA and RB with one equivalent resistor, Requivalent. Requivalent = RB  J. Gabrielse

  11. - - + + Resistors in ParallelExample 30Ω Requivalent = 20Ω What is Requivalent? J. Gabrielse

  12. Notes

  13. Your Turn: Practice Problems p. 515: 5, 6, 7 Questions?  Come see me. Get your class work grade before you leave.

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