Electricity
What is electric current? Define it and state its SI unit.
Define electric potential difference between two points in an electric circuit.
State Ohm's Law clearly and write its mathematical formula.
List the factors on which the resistance of a cylindrical conductor depends.
Define resistivity. Write its standard SI unit.
Why are alloys used rather than pure metals in electrical heating devices?
What is the equivalent resistance formula when resistors are connected in parallel?
State Joule's Law of Heating and write its mathematical expression.
Define one kilowatt-hour (kWh) and state its relation with joules.
Why is a parallel connection preferred over a series connection for domestic circuits?
What is an electric fuse? Mention its primary role in a circuit.
State Ohm's law.
What is electric power? Write its SI unit.
State Ohm's Law. Write the mathematical expression for it and draw a labelled circuit diagram to verify this law experimentally.
On what factors does the resistance of a cylindrical conductor depend? Explain each factor clearly.
Explain the Joule's Law of Heating. Write its mathematical formula and mention two practical applications of this effect in daily life.
An electric lamp of resistance $20\ \Omega$ and a conductor of $4\ \Omega$ resistance are connected in series to a $6\text{ V}$ battery. Calculate: (a) the total resistance of the circuit, (b) the current through the circuit, and (c) the potential difference across the electric lamp and conductor.
State Ohm's law. Describe an activity to verify Ohm's law experimentally. Draw a labeled circuit diagram and the expected V-I graph.
What is Joule's law of heating? Derive the expression for heat produced in a resistor. An electric iron consumes energy at a rate of $840, \text{W}$ when heating is at the maximum rate and $360, \text{W}$ when the heating is at the minimum. The voltage is $220, \text{V}$. Calculate the current and the resistance in each case.
State Ohm's law. Describe an activity to verify Ohm's law experimentally with the help of a circuit diagram. Also, draw the V-I graph and explain how resistance can be determined from it.
What is Joule's heating effect of electric current? Derive the mathematical expression for it. Also, explain any two practical applications of heating effect of electric current in daily life.
State Ohm's Law. Describe an activity to verify Ohm's Law experimentally with the help of a circuit diagram, and draw the corresponding V-I graph.