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To create a resistor with a small resistance (or Ohm) value, use a thicker, shorter wire as the path between the two electrical leads. To create a resistor with a larger Ohm value, use a thinner, longer wire.

## How do you create electrical resistance?

**Ohms Law and Power**

- To find the Voltage, ( V ) [ V = I x R ] V (volts) = I (amps) x R (Ω)
- To find the Current, ( I ) [ I = V ÷ R ] I (amps) = V (volts) ÷ R (Ω)
- To find the Resistance, ( R ) [ R = V ÷ I ] R (Ω) = V (volts) ÷ I (amps)
- To find the Power (P) [ P = V x I ] P (watts) = V (volts) x I (amps)

## What is electrical resistance formula?

Resistance has units of ohms (Ω), related to volts and amperes by **1 Ω = 1 V/A**. There is a voltage or IR drop across a resistor, caused by the current flowing through it, given by V = IR.

## What are 3 ways to increase resistance?

**length – longer wires** have greater resistance. thickness – smaller diameter wires have greater resistance. temperature – heating a wire increases its resistance.

## Which change decreases the resistance of a piece of copper wire?

Resistance decreases as copper (or any other metal) **is cooled**. Its atoms vibrate less, and so they impede the flow of electrons less. Pure copper has less resistance than copper containing impurities. Impurity atoms are a different size to copper atoms, so they get in the way of moving electrons.

## What four things does the resistance of a wire depend on?

The resistance of a conductor depends on **the cross sectional area of the conductor, the length of the conductor, and its resistivity**. It is important to note that electrical conductivity and resistivity are inversely proportional, meaning that the more conductive something is the less resistive it is.

## What is electrical resistance and its unit?

Electric resistance has the dimension length squared mass per time cubed electric current squared. The SI derived unit of electric resistance is **the ohm**, which is defined as a volt per ampere. … A preece is defined as ohms.

## What is current formula?

The current is the ratio of the potential difference and the resistance. It is represented as (I). The current formula is given as **I = V/R**. The SI unit of current is Ampere (Amp).

## What is the resistance of a wire?

The ohm is the common unit of electrical resistance, equivalent to one volt per ampere and represented by the capital Greek letter omega, Ω. The resistance of a **wire is directly proportional to its length and inversely proportional to its cross-sectional area**.

## What can I use in place of a resistor?

**A good conductor, such as metal wire**, can be used as a Resistor. Resistance can be adjusted by limiting the thickness of the wire or decreasing the path through it. Resistance can be controlled by wire.

## What are the disadvantages of resistance training?

**Disadvantages:**

- angle specific.
- limited use in sports.
- limited strength and endurance gains.
- cannot monitor intensity.
- large increases in blood pressure.