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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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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…
Loads in Series
• More loads = more resistance
Loads in Parallel
• Current will divide and junction points
Measuring Voltage
• Voltmeter• Connected in parallel• Measuring voltage across resistance– Require two points
Measuring Amperes
• Ammeter• Connected in series• Measuring current passing through resistance
Circuit Diagrams
• Drawing of circuit using symbols
Homework
• Page 450 # 1, 3, 4• Page 453 # 1-5• Page 457 # 2,3, 5, 6
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