# Resistors In Series And Parallel Circuits Pdf

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*The first principle to understand about parallel circuits is that the voltage is equal across all components in the circuit. This is because there are only two sets of electrically common points in a parallel circuit, and the voltage measured between sets of common points must always be the same at any given time. Therefore, in the above circuit, the voltage across R 1 is equal to the voltage across R 2 which is equal to the voltage across R 3 which is equal to the voltage across the battery.*

*The goal of series-parallel resistor circuit analysis is to be able to determine all voltage drops, currents, and power dissipations in a circuit. The general strategy to accomplish this goal is as follows:. This may sound like an intimidating process, but its much easier understood through example than through description.*

Objectives :. Equipment :. A few ceramic resistors to ohms , a dc-power source, 2 multi-meters, a calculator, and a few connecting wires with alligator clips. Theory I :.

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In the previous part we identified how the resistance of a circuit can be calculated when one or more resistors are combined in series. In this section we develop our knowledge of circuit analysis by examining parallel combination of resistors.

When two or more resistors are connected between identical points in a circuit the resistors are said to be in parallel. In this situation the current has a number of different possible pathways, for example in the circuit below which represents two resistors in parallel there are two possible pathways for the current to flow. Each parallel current path is called a branch and if additional branches are added then more possible current paths are created eg.

In this circuit all the connecting points along the bottom rail are equivalent to B and all the connecting points along the top rail equivalent to point A. The total current flowing iT can be calculated by using Kirchhoff's current law. The voltage dropped across each branch is identical to the source voltage V , so using Ohms law to replace each current with the voltage and resistance gives.

Cancelling the voltage terms shows how the total resistance can be calculated from the individual components ie. Now let us use an example to evaluate the individual currents flowing in each branch of the following circuit. As we know the total current flowing in the circuit we can work out the value of the voltage source by calculating the total resistance and then using Ohms law to convert this to the applied voltage. As we know that each branch has the source voltage dropped across it we are now able to evaluate the current for each branch.

We have now seen how to analyse circuits containing resistors in series or parallel, in many electrochemical measurements we find that the systems can be quantified in terms of combinations of series and parallel components.

The circuit analysis approach for these types of problems are set out in the following section. Search site. International students Continuing education Executive and professional education Courses in education. Research at Cambridge. Why study Chemical Engineering?

Why study Chemical Engineering at Cambridge? Entry requirements Finances and funding How do I apply? Resistors In Parallel. Introduction In the previous part we identified how the resistance of a circuit can be calculated when one or more resistors are combined in series. Identifying and Analysing Parallel Circuits When two or more resistors are connected between identical points in a circuit the resistors are said to be in parallel.

Each parallel current path is called a branch and if additional branches are added then more possible current paths are created eg In this circuit all the connecting points along the bottom rail are equivalent to B and all the connecting points along the top rail equivalent to point A.

This states that the sum of the currents into a junction is equal to the sum of the currents out of the junction. Enquiries Undergraduate admissions Postgraduate admissions Am I eligible for a scholarship? Other enquiries. Study at Cambridge Undergraduate Postgraduate International students Continuing education Executive and professional education Courses in education.

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## 10.3: Resistors in Series and Parallel

Basically, a resistor limits the flow of charge in a circuit and is an ohmic device where. Most circuits have more than one resistor. The equivalent resistance of a combination of resistors depends on both their individual values and how they are connected. The simplest combinations of resistors are series and parallel connections Figure 6. In the case of a parallel configuration, each resistor has the same potential drop across it, and the currents through each resistor may be different, depending on the resistor.

Most circuits have more than one resistor. If several resistors are connected together and connected to a battery, the current supplied by the battery depends on the equivalent resistance of the circuit. The equivalent resistance of a combination of resistors depends on both their individual values and how they are connected. In a series circuit , the output current of the first resistor flows into the input of the second resistor; therefore, the current is the same in each resistor. In a parallel circuit , all of the resistor leads on one side of the resistors are connected together and all the leads on the other side are connected together. In the case of a parallel configuration, each resistor has the same potential drop across it, and the currents through each resistor may be different, depending on the resistor.

To browse Academia. Skip to main content. By using our site, you agree to our collection of information through the use of cookies. To learn more, view our Privacy Policy. Log In Sign Up. Download Free PDF. Resistors in Series and Parallel.

## Resistors In Parallel

The amount of current in a series circuit is the same through any component in the circuit. This is because there is only one path for current flow in a series circuit. Because electric charge flows through conductors like marbles in a tube, the rate of flow marble speed at any point in the circuit tube at any specific point in time must be equal. From the way that the 9-volt battery is arranged, we can tell that the current in this circuit will flow in a clockwise direction, from point 1 to 2 to 3 to 4 and back to 1. However, we have one source of voltage and three resistances.

*Resistors in Series and Parallel Introduction Direct current DC circuits are characterized by the quantities current, voltage and resistance.*

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You must be able to use Kirchoff's Rules to calculate currents and voltages in circuit components that are not simply in series or in parallel. Page 2. Resistances in.

We cannot add the values of each resistor together like we can in the previous series circuit. So what do we need to do? Page 4. Calculating Total Resistance of a.

In the previous part we identified how the resistance of a circuit can be calculated when one or more resistors are combined in series.

To investigate the behaviour of current, voltage and resistance in series and parallel circuits with two resistors. The formulae for the total resistance in these two.