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Physics: Ohm's Law and Resistance

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Questions and Answers

What is the mathematical representation of Ohm's Law?

$R = V + I$

$I = V + R$

$V = IR$ (correct)

$I = R/V$

According to Ohm's Law, what happens to the current if the potential difference is doubled while keeping the resistance constant?

The current is halved.

The current remains the same.

The current is tripled.

The current is doubled. (correct)

If a conductor has a resistance of $2 ext{Ω}$ and the current flowing through it is $3 ext{A}$, what is the potential difference across the conductor?

$3 ext{V}$

$5 ext{V}$

$1.5 ext{V}$

$6 ext{V}$ (correct)

What does a straight line graph representing the current versus potential difference indicate about the conductor?

The conductor has constant resistance. Signup and view all the answers

What unit is used to measure resistance in a conductor?

Ohms Signup and view all the answers

If a potential difference of $1 ext{V}$ produces a current of $1 ext{A}$ in a conductor, what can be concluded about its resistance?

The resistance is $1 ext{Ω}$. Signup and view all the answers

Study Notes

Ohm's Law

Discovered by German scientist George Simon Ohm in 1828.
States that current (I) is directly proportional to potential difference (V).
Applicable under constant conditions of the conductor.

I-V Curve for a Conductor

Graph of current versus potential difference is a straight line.
Mathematically expressed as:
- ( I \propto V )
- ( V = IR )
- ( R = \frac{V}{I} )

Resistance

R is the resistance of a conductor, a proportionality constant.
Measured in ohms (Ω).
Defined unit relationship: ( 1 , \Omega = \frac{1 , Volt}{1 , Ampere} ).
A conductor with 1 Volt potential difference and 1 Ampere current has 1Ω resistance.

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Description

Explore the fundamentals of Ohm's Law, which illustrates the relationship between current and potential difference. This quiz also covers the concept of resistance and its measurement in ohms. Test your understanding of these essential electrical principles and their applications!