Please select a subject first
Advertisements
Advertisements
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: The Bar Magnet
State Fleming’s right-hand rule.
Concept: Electromagnetic Induction
State three differences between direct current and alternating current.
Concept: 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: A.C. 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 in a Magnetic Field
Tell the odd one out. Give proper explanation.
Loud speaker, Microphone, Electric motor, Magnet.
Concept: Electric Motor
Name the following diagram and explain the concept behind it.
Concept: Force on a Current Carrying Conductor in a Magnetic Field
i) Which principle is explained in this figure?
ii) Which rule is used to find out the direction of a force in this principle?
iii) In which machine this principle is used? Draw a diagram showing working of that machine
Concept: Force on a Current Carrying Conductor in a Magnetic Field
Observe the figure and answer the following questions.
a) Identify the machine shown in figure.
b) Write a use of this machine.
c) How transformation of energy takes place in this machine.
Concept: A.C. Generator
Study the following principle and answer the question.
A force is excreted on the current carrying conductor. The direction of this force depends on both the direction of the current and the direction of the magnetic field. This force is maximum when the direction of current is perpendicular to the direction of the magnetic field.
a) By which law we can determine the direction of force excreted on the current carrying conductor.
b) In which electrical equipment this principle is used.
c) Draw a diagram representing construction of this equipment.
d) Write the working of this equipment in brief.
Concept: Electric Motor
