Question 1 A piece of wire is redrawn by pulling it until its length is doubles. Compare the new resistance with the original value? Question 2 How is the resistivity of a material related to the use of that material? Question 3 On what factors does the resistance of a conductor depends? Question 4 Why connecting wires in an electric circuit are made of Cu and … [Read more...] about Resistance
Class 10
Ohm’s Law
Question 1 State ohm's law? Question 2 What is the resistance of an electric arc lamp, if the lamp uses 20 A when connected to a 220 Volt line? Question 3 Define resistance of a conductor. What is its SI unit? Question 4 Write the formula which relates electric current, time and electric current? Question 5 What kind of plot would you expect when current is plotted … [Read more...] about Ohm’s Law
Electric Potential and Potential Difference
Question 1 How much work is done in moving a charge of 2 Coulombs, from a point at 118 Volts to a point at 128 Volts? Question 2 Name the device used for measuring potential difference? Question 3 What are the conditions under which charges can move in a conductor? Question 4 How will you maintain a potential difference between the ends of a conductor? Question 5 … [Read more...] about Electric Potential and Potential Difference
Electricity
Question 1 Define the term electric current? Question 2 What is the SI unit of electric current? Question 3 Define the term ampere? Question 4 What is an open electric circuit? Question 5 What is a closed electric circuit? Electricity The flow of water in rivers and canals is called water current. The flow of charge in a conductor(metallic wire)is called … [Read more...] about Electricity
Power and Application of a Lens
Question 1 Find the power of concave lens of focal length 2m? Question 2 Find the focal length of concave lens whose power is -2 D? Question 3 The power of lens is 2.5 D. What is the focal length and the type of lens? Question 4 A convex and concave lens of focal length 50 cm and 40 cm are combined together, what is the power of the combination? Question 5 What is … [Read more...] about Power and Application of a Lens