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Ohm’s Law

Ohm’s Law. http://phet.colorado.edu/sims/ohms-law/ohms-law_en.html. To calculate voltage, V : put your finger over V, this leaves you with I R, so the equation is V = I × R To calculate current, I : put your finger over I, this leaves you with V over R, so the equation is I = V / R

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Ohm’s Law

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  1. Ohm’s Law http://phet.colorado.edu/sims/ohms-law/ohms-law_en.html

  2. To calculate voltage, V: put your finger over V, this leaves you with I R, so the equation is V = I × R • To calculate current, I: put your finger over I, this leaves you with V over R, so the equation is I = V/R • To calculate resistance, R: put your finger over R, this leaves you with V over I, so the equation is R = V/I V I R Triangle

  3. V = voltage in volts (V) • I = current in amps (A) • R = resistance in ohms (Ω) • For most electronic circuits the amp is too large and the ohm is too small, so we often measure current in milliamps (mA) V=I x R

  4. 1 milliampere = 0.001 amperes • KHDMDCM or • KHDADCM mA A

  5. I=q/∆t • I= intensity • q= charge (C) • ∆t= time interval Current Intensity

  6. The light in the girls washroom requires a current of 40 amps. What is the charge needed for 60 seconds of electricity? I=q/∆t =40 A x 60s =2400 C Example

  7. The microwave requires a current of 80 A. What is the charge needed to heat my lunch for 2 minutes? I=q/∆t =80 A x 120s =9600s Example 2

  8. How many minutes has elapsed if 24000 C of charge pass through a circuit with a current of 1.6 A? I=q/∆t 24000 = 1.6/∆t 24000/1.6 = ∆t =15000 s =250 minutes Example 3

  9. What is the voltage across a 50 Ω resistor with a current of 400 mA? 400mA= 0.4 A V=IR V= 50 Ω x 0.4 A V= 20 volts Ohm’s

  10. What is the resistance if a circuit has 228 volts and a current of 38 mA? 38 mA= 0.038 A R = V/I R = 228 V / 0.038 A R = 6000 Ω Ohm’s

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