Question

Habiba and selehadin have measured the voltage across a resistor to be 5.26V and the current flowing through in to be 0.41A they work out the resistance .
habiba says the resistance is 12.8 ohms .selehadin disagrees and says that is 13 ohm .

who is correct?.​

Answer 1

Considering the definitipn of current, voltage, power, and Ohm's law,

• Current

The flow of electricity through an object, such as a wire, is known as current (I). Its unit of measurement is amps (A). So current is a measure of the speed at which the load passes through a given reference point in a specified direction.

• Voltage

The conductive force (electrical pressure) behind the flow of a current is known as voltage and is measured in volts (V) (voltage can also be referred to as the potential difference or electromotive force). That is, voltage is a measure of the work required to move a charge from one point to another.

• Resistance

Resistance (R) refers to the resistance or opposition that an element has to the passage of electric current. It is represented by the symbol Ω and indicates the resistance that an element offers to the passage of electricity.

This means that the greater the resistance to the passage of current, the lower the intensity or amount of electricity that passes through this conductor.

The resistance that is measured in ohms.

• Ohm's law

Ohm's law indicates that the current through a circuit is directly proportional to its voltage or voltage and inversely proportional to the resistance it presents.

Mathematically, Watt's law is expressed:

$I=\frac{V}{R}$

So if you want to find resistance, the expression for its calculation is:

$R=\frac{V}{I}$

• This case

In this case, you know:

1. V= 5.26 V
2. I= 0.41 A

Replacing:

$R=\frac{5.26 V}{0.41 A}$

Solving:

R= 12.8 ohms

Habiba is right. The resistance is 12.8 ohms.

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