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In the electric equipment producing heat like iron, electric heater, boiler, toaster etc., an alloy such as nichrome is used, not pure metals.
Concept: Heating Effect of Electric Current
Draw figure ‘Electric motor’ and working
Concept: Electric Motor
Name any four appliances where electric motor is used.
Concept: Electric Motor
When does short circuiting take place?
Concept: Household Electrical Circuits
What happens to the resistance of the circuit during a short circuit?
Concept: Household Electrical Circuits
What happens to the flow of electric current during a short circuit?
Concept: Household Electrical Circuits
What is overloading?
Concept: Household Electrical Circuits
How can the effects of overloading be avoided?
Concept: Household Electrical Circuits
Magnetic lines of force are closed continuous curves.
Concept: Bar Magnet and Solenoid Analogy
State Fleming’s right-hand rule.
Concept: Introduction to Electromagnetic Induction
State three differences between direct current and alternating current.
Concept: Introduction to Electromagnetic Induction
Why should the wires carrying electricity not be touched barefooted?
Concept: Household Electrical Circuits
The device used for producing electric current is called a ______.
Concept: Alternating-Current Generator
State whether the following statement is true or false.
An electric motor converts mechanical energy into electrical energy.
Concept: Electric Motor
State the right-hand thumb rule.
Concept: Right-hand Thumb Rule
Explain the construction and working of an electric motor.
Concept: Electric Motor
Label the four parts of an electric motor
Concept: Electric Motor
write two uses of DC motor
Concept: Simple D.C. Motor
Observe the following figure:
If the current in the coil A is changed, will some current be induced in the coil B? Explain.
Concept: Force on a Current-Carrying Conductor Placed in a Uniform Magnetic Field
Tell the odd one out. Give a proper explanation.
Concept: Electric Motor
