Unit 7 Parallel Circuits Objectives: • Discuss the characteristics of parallel circuits. • State the three rules for solving electrical values of resistance for parallel circuits. • Solve the missing values in a parallel circuit using the three rules and Ohm’s law.
Unit 7 Parallel Circuits. Objectives: Discuss the characteristics of parallel circuits. State the three rules for solving electrical values of resistance for parallel circuits. Solve the missing values in a parallel circuit using the three rules and Ohm’s law. Unit 7 Parallel Circuits. - PowerPoint PPT Presentation
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Unit 7 Parallel Circuits
Objectives:• Discuss the characteristics of parallel
circuits.• State the three rules for solving electrical
values of resistance for parallel circuits.• Solve the missing values in a parallel
circuit using the three rules and Ohm’s law.
Unit 7 Parallel Circuits
Objectives:• Calculate current values using the
current divider formula.
Unit 7 Parallel Circuits
Three Parallel Circuit Rules• The voltage drop across any branch is
equal to the source voltage.• The total current is equal to the sum of the
branch currents.• The total resistance is the reciprocal of the
sum of the reciprocals of each individual branch.
Unit 7 Parallel CircuitsParallel circuits are circuits that have more than one
path for current to flow.I (total current) = 3A + 2A + 1A = 6A
Unit 7 Parallel Circuits
Lights and receptacles are connected in parallel. Each light or receptacle needs 120 volts.
Panel
Unit 7 Parallel CircuitsThe voltage drop across any branch of a
parallel circuit is the same as the applied (source) voltage.
Panel
Unit 7 Parallel CircuitsThe voltage drop across any branch of a parallel
circuit is the same as the source voltage.
E1 = 120 V E2 = 120 V
E3 = 120 VE = 120 V
Unit 7 Parallel CircuitsParallel Resistance Formulas
The Reciprocal Formula:1/R(total) = 1/R1 + 1/R2 + 1/R3 …1/R(number)
The Resistors of Equal Value Formula:R(total) = R(any resistor)/N(number of resistors)
The Product-Over-Sum Formula:R(total) = (R1 x R2) / (R1 + R2)
Unit 7 Parallel Circuits
The Reciprocal FormulaThe total resistance of a parallel circuit is the
reciprocal of the sum of the reciprocals of the individual branches.1/R(total) = 1/R1 + 1/R2 + 1/R3 …1/R(number)
R(total) R1 R2 R3
Unit 7 Parallel Circuits
Reciprocal Formula Example1/R(total) = 1/R1 + 1/R2 + 1/R3 …1/R(number)