Ohm's law gives a relationship between:(a) current and resistance(b) resistance and potential difference(c) potential difference and electric charge(d) current and potential difference
Ohm's law gives a relationship between: (d) current and potential difference
Ohm's law states that at a constant temperature, the current passing through a conductor is directly proportional to the potential difference applied across it.
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The work done in moving a unit charge across two points in an electric circuit is a measure of :(a) current(b) potential difference(c) resistance(d) power
State Ohm's law. Give Mathematical relation between potential difference (V), Current (I) and resistance (R) of a conductor. Draw an electric circuit for studying ohm's law.
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(a) Name a device which helps to maintain a potential difference across the ends of a conductor(b) What is meant by saying that the potential difference between two points is 1 V? (c) Define Ohm's law. Write an expression for it. (d) What is the unit of resistance? (e) When the potential difference between the terminals of an electric heater is 110 V, a current of 5 A flows through it. What current will flow through the heater if the potential difference is increased to 220 V ? What is the resistance of heater?
(a) What is the ratio of potential difference and current known as? (b) The values of potential difference $V$ applied across a resistor and the correponding values of current $I$ flowing in the resistor are given below: Potential difference, $V$ (in volts) : $\begin{array}{llllll}2.5 & 5.0 & 10.0 & 15.0 & 20.0 & 25.0\end{array}$Current, $I$ (in amperes) : $\begin{array}{llllll}0.1 & 0.2 & 0.40 & 0.60 & 0.80 & 1.0\end{array}$Plot a graph between $V$ and $I$, and calculate the resistance of the resistor.(c) Name the law which is illustrated by the above $V-I$ graph.(d) Write down the formula which states the relation between potential difference, current and resistance.(e) The potential difference between the terminals of an electric iron is $240 \mathrm{~V}$ and the current is $5.0 \mathrm{~A}$. What is the resistance of the electric iron?
The values of current (I) flowing through a given resistor of resistance (R), for the corresponding values of potential difference (V) across the resistor are as given below :V (Volts)0.51.01.52.02.53.04.05.0I (Amperes)0.10.20.30.40.50.60.81.0Plot a graph between current (I) and potential difference (V) and determine the resistance (R) of the resistor.
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A potential difference of 20 volts is applied across the ends of a resistance of 5 ohms. What current will flow in the resistance?
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