Question

$\pink{\huge{\sf Questions: - }}$
$\boxed{ \green1}$ The Potential Difference Between the terminals of an electric heater is 60V when it draws a current of 4 A from the source. What current will the heater draw if the potential difference is increased to 120V?

$\boxed{ \red1}$ What is Open Circuit and Closes Circuit?

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Answer 1

Answer:

1) The potential difference between the terminals of an electric heater is 60 V when it draws a current of 4 A from the source. Thus, the current drawn by the heater is doubled when the potential difference across the terminals is doubled.

2) An open circuit is one where the continuity has been broken by an interruption in the path for current to flow. A closed circuit is one that is complete, with good continuity throughout. An open switch is one without continuity: current cannot flow through it.

Step-by-step explanation:

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Answer 2

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Given:

• Potential Difference, V = 60 V
• Current, I = 4 A

Find:

• Amount of Current Heater will draw if potential Difference is 120 V

Solution:

we, know that According to ohm's Law

$\boxed{\sf R = \dfrac{V}{I}}$

where,

• Potential Difference, V = 60V
• Current, I = 4A

So,

$\dashrightarrow\sf R = \dfrac{V}{I}$

$\dashrightarrow\sf R = \dfrac{60}{4}$

$\dashrightarrow\sf R = 15 \Omega$

$\sf Thus,R = 15 \Omega$

Now, when the Potential Difference is increased to 120V

we, know

$\boxed{\sf I = \dfrac{V}{R}}$

where,

• Potential Difference, V = 120V
• Resistance = 15 $\Omega$

So,

$\dashrightarrow\sf I = \dfrac{V}{R}$

$\dashrightarrow\sf I = \dfrac{120}{15}$

$\dashrightarrow\sf I = 8A$

$\therefore\sf I = 8A$

Hence, When the Potential Difference is increased to 120 V the current drawn through heater is 8A

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➋

Open Circuit:

In an Open Circuit. The two terminals are points which are externally disconnected.

It is equivalent to Resistance, R = $\infty$

Its means that there is no current flows through the two Terminals.

Diagram:

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Closed Circuit:

In an Closed Circuit. The two terminals points are externally Connected.

It means the current flows through Circuit in a continuous path without any interruption.

Diagram:

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