11. Compare V 1 the voltage across R 1 , with V 10 the voltage across R 10 . 1. V 1 >V 10 2. V 1 =V 10 3. V 1 <V 10 ACT: Series Circuit R 1 =1 0 R 10 =10
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17. Johnny “Danger” Powells uses one power strip to plug in his microwave, coffee pot, space heater, toaster, and guitar amplifier all into one outlet. Toaster This is dangerous because… (By the way, power strips are wired in parallel.) ACT: Your Kitchen 1. The resistance of the kitchen circuit is too high. 2. The voltage across the kitchen circuit is too high. 3. The current in the kitchen circuit is too high. Coffee Pot Microwave 10 A 5 A 10 A 25 A
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21. Voltage Current Resistance Series Parallel Summary Different for each resistor. V total = V 1 + V 2 Increases R eq = R 1 + R 2 Same for each resistor I total = I 1 = I 2 Same for each resistor. V total = V 1 = V 2 Decreases 1/R eq = 1/R 1 + 1/R 2 Wiring Each resistor on the same wire. Each resistor on a different wire. Different for each resistor I total = I 1 + I 2 R 1 R 2 R 1 R 2
Editor's Notes
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Resistance Demo 1055 Ramp with balls as resistor (Ohm’s Law)—change height Ohm’s Law Demo 1228 Water resistance, effect of A, L on flow
Demo 1091: lots of appliances to blow fuse—do this while ACT is going on
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