1. Solving Series circuits How to Whiteboards

2. A Series Circuit has many voltages, but only one current 24 V 1  2  5  V1V1 A1A1 A3A3 A2A2 V2V2 V3V3 How to solve series: 1. Find the total resistance 2. Find the one current 3. Use V = IR to find voltages

3. A1A1 A2A2 R1R1 R2R2 R3R3 I Analogy - ping pong balls - electrons All start moving at once/speed of impulse, speed of particles Resistance anywhere along the tube limits flow everywhere

4. Whiteboards 1 | 2 | 3 | 4

5. What do the meters read? (3 SF) V1V1 V2V2 20.0 V 5  7  11 .870 A, 4.35 V, 15.7 V V = IR V 1 = ( 5  )(.8696 A) = 4.35 V V 2 = ( 18  )(.8696 A) = 15.7 V A1A1 A2A2

6. V1V1 V2V2 35 V 5  9  11  4.27 V, 17.1 V, 11.1 V R = 41 , I =.8537 A V = IR V 1 = ( 5  )(.8537 A) = 4.27 V V 2 = ( 20  )(.8537 A) = 17.1 V V 3 = ( 13  )(.8537 A) = 11.1 V 13  3  V3V3 What do the voltmeters read? (3 SF)

7. V1V1 V2V2 120 V 500  90  200  58.3 V, 10.5 V, 38.4 V R = 1030 , I =.1165 A V = IR V 1 = ( 500  )(.1165 A) = 58.3 V V 2 = ( 90  )(.1165 A) = 10.5 V V 3 = ( 330  )(.1165 A) = 38.4 V 130  110  V3V3 What do the voltmeters read? (3 SF)

8. What is the value of the mystery resistor if V 1 reads 3.17 V (3 SF) V1V1 20 V 5  7  ???  19.5  I = V/R = (3.17 V)/(5  )=.634 A R tot = V/I = (20 V)/(.634 A) = 31.55  R tot = 5  + 7  + ?? = 31.55  ?? = 19.5 