21.1 Resistors in Series and Parallel Most circuits have more than one component, called a resistor that limits the flow of charge in the circuit. A measure of this limit on charge flow is called resistance. The simplest combinations of resistors are the series and parallel connections illustrated in Figure 21.2. The total resistance of a combination of resistors depends on both their individual values and how they are connected. R, R. R3 R. (a) R, R2 R3 R4 (b) Figure 21.2 (a) A series connection of resistors. (b) A parallel connection of resistors.

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Resistors in Series and Parallel
• Draw a circuit with resistors in parallel and in series.
• Calculate the voltage drop of a current across a resistor using Ohm’s law.
• Contrast the way total resistance is calculated for resistors in series and in parallel.
• Explain why total resistance of a parallel circuit is less than the smallest resistance of any of the resistors in that
circuit.
• Calculate total resistance of a circuit that contains a mixture of resistors connected in series and in parallel.

21.1 Resistors in Series and Parallel
Most circuits have more than one component, called a resistor that limits the flow of charge in the circuit. A measure of this limit
on charge flow is called resistance. The simplest combinations of resistors are the series and parallel connections illustrated in
Figure 21.2. The total resistance of a combination of resistors depends on both their individual values and how they are
connected.
R,
R.
R3
R.
(a)
R,
R2
R3
R4
(b)
Figure 21.2 (a) A series connection of resistors. (b) A parallel connection of resistors.
Transcribed Image Text:21.1 Resistors in Series and Parallel Most circuits have more than one component, called a resistor that limits the flow of charge in the circuit. A measure of this limit on charge flow is called resistance. The simplest combinations of resistors are the series and parallel connections illustrated in Figure 21.2. The total resistance of a combination of resistors depends on both their individual values and how they are connected. R, R. R3 R. (a) R, R2 R3 R4 (b) Figure 21.2 (a) A series connection of resistors. (b) A parallel connection of resistors.
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