J. Gabrielse Ohm’s law V I R. J. Gabrielse Voltage (V) Definition: what pushes charges Unit: volt (V) Measured by putting voltmeter in parallel. -+

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Presentation transcript:

J. Gabrielse Ohm’s law V I R

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

J. Gabrielse 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. -+

J. Gabrielse 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.

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

J. Gabrielse VRVR ? I R I R Ohm’s Law: V = I R V I R V = I = R = ? What is the equation for I? ?

J. Gabrielse VRVR ? I R I R VIVI Ohm’s Law: V = I R V I R V = I = R = What is the equation for R? ?

J. Gabrielse R equivalent = R A + R B Resistors in Series -+ RARA RBRB = -+ R equivalent What is the resistance of the circuit? We can replace R A and R B with an equivalent resistor, R equivalent.

J. Gabrielse R equivalent R equivalent = 50 Ω Resistors in Series Example Ω20 Ω = -+ R equivalent = R A + R B = 30Ω + 20Ω = 50Ω

J. Gabrielse Resistors in Parallel -+ RARA RBRB = -+ R equivalent  In parallel circuits we can also replace R A and R B with one equivalent resistor, R equivalent. J. Gabrielse

What is R equivalent ? Resistors in Parallel Example -+ = -+ R equivalent 30 Ω 20 Ω J. Gabrielse

Notes

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