Equation for resistance

What is the formula for resistance?

If you know the total current and the voltage across the whole circuit, you can find the total resistance using Ohm’s Law: R = V / I. For example, a parallel circuit has a voltage of 9 volts and total current of 3 amps. The total resistance RT = 9 volts / 3 amps = 3 Ω.

What is the formula to calculate the unknown resistance?

Each time you can calculate the unknown resistance using the formula:unknown resistance(a)=known resistance(b)*L/M. The value is found to be the same for all values of known resistance.

What is current formula?

Current is usually denoted by the symbol I. Ohm’s law relates the current flowing through a conductor to the voltage V and resistance R; that is, V = IR. An alternative statement of Ohm’s law is I = V/R.

What is an example of resistance?

Resistance is defined as a refusal to give in or to something that slows down or prevents something. An example of resistance is a child fighting against her kidnapper. An example of resistance is wind against the wings of a plane.

How do you calculate color code resistance?

Calculating Resistor Values For example, a resistor has the following coloured markings; Yellow Violet Red = 4 7 2 = 4 7 x 102 = 4700Ω or 4k7 Ohm. The fourth and fifth bands are used to determine the percentage tolerance of the resistor.

What is Colour code of resistance?

Resistor Color Coding uses colored bands to quickly identify a resistors resistive value and its percentage of tolerance with the physical size of the resistor indicating its wattage rating. The colors brown, red, green, blue, and violet are used as tolerance codes on 5-band resistors only.

How do you calculate nominal resistance?

First find the “nominal resistance,” or 470K in this case. Take the nominal value and multiply it by 1 + your tolerance, which is (1+0.1). Then take the nominal value and multiply it by 1 – tolerance, or (1-0.1). The highest possible value is 517 K.

What is the formula of Metre bridge?

The metre bridge, also known as the slide wire bridge consists of a one metre long wire of uniform cross sectional area, fixed on a wooden block. A scale is attached to the block. ρ=Lπr2X ; Where L be the length of the wire and r be its radius.

How do you calculate resistance in parallel?

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 + If one of the parallel paths is broken, current will continue to flow in all the other paths.

How do you calculate resistance of a cable?

CALCULATION OF CABLE RESISTANCEHence R = 22.5/10 = 2.25 Ohms per km.Length of conductor = 500m =500/1000 = 0.5km.Therefore resistance of copper conductor = 2.25 x 0.5 =1.125 Ohms. Similarly for Aluminium, The resistance per km for Aluminium is given by:R = 36/S(c.s.a)Again S = 10mmsq.Hence R = 36/10 = 3.6 Ohms per km.Length of conductor = 0.5km.

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What is the SI unit of resistance?

The ohm (symbol: Ω) is the SI derived unit of electrical resistance, named after German physicist Georg Ohm.

What is work formula?

Work is done when a force that is applied to an object moves that object. The work is calculated by multiplying the force by the amount of movement of an object (W = F * d).

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