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Questions and Answers
What is the mathematical representation of Ohm's Law?
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?
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?
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?
What does a straight line graph representing the current versus potential difference indicate about the conductor?
What unit is used to measure resistance in a conductor?
What unit is used to measure resistance in a conductor?
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?
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?
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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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