Question

Using ohm's law calculate the voltage when 3 resistors each of resistance 10Ω is connected in series connection and the current in the circuit is 20 Ampere.

Answer should be in SI unit and well explained.

Answer 1

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Answer 2

Given :-

• 3 resistors each of resistance 10Ω are connected in series.

• Current in circuit is 20 Ampere.

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To find :-

• Voltage of the whole circuit in SI unit using ohm's law

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Explanation :-

To find the voltage of whole circuit, firstly we have to find the total resistance in the circuit. We know that total resistance in the circuit can be obtained by addition of all the resistors connected in circuit. So we have to find equivalent resistance and then by applying ohms law, we can find value of potential difference or voltage in the circuit.

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Solution :-

~Finding total resistance

Total Resistance=Sum of all resistors connected in circuit

Total resistance=10Ω+10Ω+10Ω

Total resistance=30Ω

So the total resistance in the circuit is 30Ω.

$\rule{200}{1}$

~Finding voltage

We have ohm's law:

$\large\boxed{\star\;\;\sf{V=IR}}$

$\sf Here\begin{cases}\sf V=Voltage\:or\: potential\: difference\\\sf I=Current\:in\: the\: circuit\\\sf R=Total\: resistance (Or\:a\: Constant)\end{cases}$

Now substituting values of total resistance and current.

$\sf \implies V=(20\: Ampere)(30\Omega)$

$\sf\implies V= 600\: Ampere.\Omega$

$\underline{\boxed{\bf\;\; V= 600\: volt}}$

This is the required voltage.

The SI unit of potential difference is volt.

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