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Building Circuits

Building Circuits. Why are some Christmas lights more expensive than others?

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Series vs. Parallel Circuits Series circuit have only one path – I T = I 1 = I 2 = I 3 … – V T = V 1 + V 2 + V 3 … – R T = R 1 + R 2 + R 3 … Parallel circuits have more than one path – I T = I 1 + I 2 + I 3 … – V T = V 1 = V 2 = V 3 … – 1/R T = 1/R 1 + 1/R 2 + 1/R 3 …

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Page 1: Building Circuits. Why are some Christmas lights more expensive than others?

Building Circuits

Page 2: Building Circuits. Why are some Christmas lights more expensive than others?

• Why are some Christmas lights more expensive than others?

Page 3: Building Circuits. Why are some Christmas lights more expensive than others?

Series vs. Parallel Circuits

• Series circuit have only one path– IT = I1 = I2 = I3…

– VT = V1 + V2 + V3…

– RT = R1 + R2 + R3…

• Parallel circuits have more than one path– IT = I1 + I2 + I3…

– VT = V1 = V2 = V3…

– 1/RT = 1/R1 + 1/R2 + 1/R3…

Page 4: Building Circuits. Why are some Christmas lights more expensive than others?
Page 5: Building Circuits. Why are some Christmas lights more expensive than others?

Loads in Series

• More loads = more resistance

Page 6: Building Circuits. Why are some Christmas lights more expensive than others?

Loads in Parallel

• Current will divide and junction points

Page 7: Building Circuits. Why are some Christmas lights more expensive than others?

Measuring Voltage

• Voltmeter• Connected in parallel• Measuring voltage across resistance– Require two points

Page 8: Building Circuits. Why are some Christmas lights more expensive than others?

Measuring Amperes

• Ammeter• Connected in series• Measuring current passing through resistance

Page 9: Building Circuits. Why are some Christmas lights more expensive than others?

Circuit Diagrams

• Drawing of circuit using symbols

Page 10: Building Circuits. Why are some Christmas lights more expensive than others?

Homework

• Page 450 # 1, 3, 4• Page 453 # 1-5• Page 457 # 2,3, 5, 6