The equivalent resistance represents the total effect of all resistors in the circuit. The equivalent resistance can be measured in either a series or parallel circuit. Resistor comprises two junctions with which the current passes in and out of it.
What is meant by equivalent resistance?
What is Meant by the Equivalent Resistance? In Physics, an equivalent Resistance is defined as the sum of the resistance of the resistors connected in a circuit. The resistors can be connected in series or parallel. Assume that R1, R2 and R3 be the three resistors
How to determine equivalent resistance?
a) Determination of the equivalent resistance of two resistors when connected in parallel.
- Aim. To determine the equivalent resistance of two resistors when connected in parallel.
- Theory. If the resistors are connected in parallel along with a battery, then the total current I is calculated as a sum of the separate value of current through each …
- Materials Required
- Procedure. …
- Observation Table
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- Precautions. …
What is equivalent resistance of ideal voltage source?
r = 0. Thus, the internal resistance of an ideal voltage source is always zero. However, no such source exists in the world. All the sources of voltage have some series connected internal resistance and hence its terminal voltage vary with current I as per (1). Such sources are called practical / real voltage source.
Which is the best definition of resistance?
electrical resistance – a material’s opposition to the flow of electric current; measured in ohms electric resistance, impedance, ohmic resistance, resistivity, resistance electrical phenomenon – a physical phenomenon involving electricity ohmage – the ohmic resistance of a conductor
What is meant by equivalent resistance?
The equivalent resistance of a network is that single resistor that could replace the entire network in such a way that for a certain applied voltage V you get the same current I as you were getting for a network.
What is the equivalent resistance in the circuit?
Equivalent Resistance: The equivalent resistance of a circuit is the total electrical resistance caused by all of the resistors in the circuit acting together against the voltage source. The following two problems demonstrate how to calculate equivalent resistance in a parallel circuit.
What is the equivalent resistance formula?
The equivalent resistance is the algebraic sum of the resistances (Equation 10.3. 2): RS=R1+R2+R3+R4+R5=20Ω+20Ω+20Ω+20Ω+10Ω=90Ω. The current through the circuit is the same for each resistor in a series circuit and is equal to the applied voltage divided by the equivalent resistance: I=VRS=9V90Ω=0.1A.
What is the difference between equivalent resistance and resistance?
What is the difference between Equivalent Resistance and Effective Resistance? Equivalent resistance is a purely resistive property, which does not change with any other variable. Effective resistance is another name given to the impedance. Impedance is a property, which changes with the frequency of the signal.
What is the unit for equivalent resistance?
The equivalent resistance of a number of resistors in series is the sum of the individual resistance values. The unit of resistance is the Ohm (Ω), which is equal to a Volt per Ampere (1 Ω = 1 V/A).
What is the symbol of equivalent resistance?
In electrical circuits, it is possible to replace a group of resistors with a single equivalent resistor. The equivalent resistance of a number of resistors in series will be the sum of the individual resistances. The unit of resistance is the Ohm i.e. in symbol \Omega.
What is the equivalent resistance of the resistors?
The equivalent resistance of a set of resistors in a series connection is equal to the algebraic sum of the individual resistances. Figure 6.2. 2 (a) Three resistors connected in series to a voltage source. (b) The original circuit is reduced to an equivalent resistance and a voltage source.
How do you find equivalent resistance in parallel?
How do you calculate two resistors in parallel? Take their reciprocal values, add the two together and take the reciprocal again. For example, if one resistor is 2 Ω and the other is 4 Ω, then the calculation to find the equivalent resistance is 1 / (1/2 + 1/4) = 1 / (3/4) = 4/3 = 1.33.
How do you find the equivalent resistance of a circle?
The sum of the currents through each path is equal to the total current that flows from the source. You can find total resistance in a Parallel circuit with the following formula: 1/Rt = 1/R1 + 1/R2 + 1/R3 +… Rt = R (t)otal.
1. How much importance does equivalent resistance have in the actual world?
Equivalent resistance is a very important formula in the actual world. It helps us calculate total equivalent circuits without drawing them physica…
2. What should I do if I get stuck while practicing the equivalent resistance formula?
If you get stuck while practicing, take a step back and review what you know about basics before moving forward again so these concepts don’t get t…
3. I have heard about the 1/2 rule but did not understand this also correctly. What does this mean?
This means there are two resistors in parallel so their equivalent resistance will be half of each individual resistors’ value because both drop th…
4. What are the main factors other than resistance that affect the equivalent resistance of the resi…
There are other parameters which affect the value of equivalent resistance apart from values of resistors. It includes wire length, insulation type…
5. What about two resistors in parallel? Will they act as one same resistance or two different resis…
Two resistors in parallel means that both are in same direction to flow of current i.e. when placed head-to-tail, so there is no voltage potential…
6. What is Resistance? How does the Resistance differ from the Equivalent Resistance?
Resistance is the opposition that a material offers to the flow of electric current through it. It is represented by the uppercase letter R. The st…
What is the Equivalent Resistance?
The equivalent resistance is where the total resistance connected either in parallel or in series. Electrical resistance shows that how much energy will be required when we move the charges i.e. current through the circuit. If we need lots of energy, then the resistance necessary should also be high. The equivalent resistance of a network is the single resistor which can replace the entire network in such a way that for a certain applied voltage as V we will get the same current as I.
What does more resistance mean?
More resistance means for the less current flowing through the circuit. If the electrical circuit is having many resistances connected, then we need to find their accumulated resistance value. Thus, the equivalent resistance is a different way of indicating the total resistance. It will be calculated differently for series and parallel circuits.
What is the unit of resistance in electrical circuits?
The equivalent resistance of a number of resistors in series will be the sum of the individual resistances. The unit of resistance is the Ohm i.e. in symbol Omega.
What is the Equivalent Resistance?
The equivalent resistance is defined as a common point or node where the total resistance is measured in a series or parallel arrangement (in either the whole circuit or in a fraction of the circuit).
What does more resistance mean?
More resistance means less current flows through the circuit and vice-versa. The equivalent resistance is a different way of indicating ‘total effective’ resistance, which we calculate differently for series and parallel circuits. Share this with your friends. Share.
Why use parallel arrangement of resistors?
In a place where there are fewer chances of an accident, we can use the parallel arrangement of resistors to avoid any mishappening. So, here the road is an electrical circuit and obstruction is the resistance.
What is the purpose of a single resistor in an electrical network?
In the equivalent resistance of an electrical network, a single resistor can substitute the complete network so that a particular applied voltage or the equivalent current can be obtained similar to the one when utilized as a network.
What is resistance in a circuit?
Bookmark added to your notes. Resistance is the speed breaker that is connected to the circuit to protect it from the high current flow. When we connect two or more resistances in series or in parallel to each other, the security of the circuit increases.
How many junctions does a resistor have?
Resistor comprises two junctions through which the current passes in and out. Resistors are passive devices that use electricity . In order to improve the total resistance, the resistors must be connected in series, and to reduce the resistance, the resistors must be connected in parallel.
What is the measure of how much an electrical device or material can resist or obstruct the movement of electric current?
Resistance is a measure of how much an electrical device or material can resist or obstruct the movement of electric current through it. It is inversely related to current, which means the higher resistance is, the lesser is the current flow; reduced resistance means higher current flow in the circuit.
Why is DC wire resistance important?
The DC wire resistance is an important parameter in transformer and general inductor design because it contributes to the impedance of the component, and current flowing through that resistance is dissipated as waste heat, and energy is lost from the circuit.
What is ESR in capacitors?
However, they can be treated, to a very good degree of approximation, as being ideal capacitors and inductors in series with a resistance; this resistance is defined as the equivalent series resistance ( ESR ). If not otherwise specified, the ESR is always an AC resistance, which means it is measured at specified frequencies, 100 kHz for switched-mode power supply components, 120 Hz for linear power-supply components, and at its self-resonant frequency for general-application components. Additionally, audio components may report a ” Q factor “, incorporating ESR among other things, at 1000 Hz.
Why are capacitors, inductors, and resistors designed?
Capacitors, inductors, and resistors are usually designed to minimise other parameters. In many cases this can be done to a sufficient extent that parasitic capacitance and inductance of a resistor, for example, are so small as not to affect circuit operation. However, under some circumstances parasitics become important and even dominant.
Which factor is related to ESR?
Q factor, which is related to ESR and is sometimes a more convenient parameter than ESR to use in calculations of high-frequency non-ideal performance of real inductors, is quoted in inductor data sheets.
What is electrical circuit theory?
Electrical circuit theory deals with ideal resistors, capacitors and inductors, each assumed to contribute only resistance, capacitance or inductance to the circuit. However, all components have a non-zero value of each of these parameters. In particular, all physical devices are constructed of materials with finite electrical resistance, …
The Equivalent Resistance Concept Builder assesses student understanding of the equivalent resistance of a series and a parallel circuit. There are 54 total questions that are organized into 18 different Question Groups and spread across three activities. The three activities include Series Circuits, Parallel Circuits, and Both Types of Circuits .
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Users are encouraged to open the Concept Builder and explore. There is no need for an activity sheet for this Concept Builder. However, the 18 different groups of questions can be printed. View Questions (For Teachers Only).