Write down the difference between dynamo and electric motor. What is earthing?
WBBSE
Class X
Physical Science
Current Electricity
03 Mark
2024
Difference between Dynamo and Electric Motor:
| Feature | Dynamo | Electric Motor |
|---|---|---|
| Function | Converts mechanical energy into electrical energy (generator). | Converts electrical energy into mechanical energy. |
| Operation | Works on the principle of electromagnetic induction (Faraday’s law). | Works on the principle of Lorentz force (interaction of magnetic field and current). |
Earthing is the process of connecting the electrical circuit or equipment to the ground (earth). It provides a safe path for the current to flow into the earth in case of a fault, reducing the risk of electrical shock and preventing damage to electrical devices.
Related Questions
More WBBSE Easy level questions
1/12
Q.
Establish the relationship between internal resistance and EMF of an electric cell.
A.
Current (I) = Current (I) = ∴ E = I (R +...
Q.
By which rule is the direction of rotation of Barlow’s wheel determined?
A.
The direction of rotation of Barlow's wheel is determined by Fleming's Left-Hand...
Q.
What would be the equivalent resistance of a circuit containing resistances of 6 Ω and...
A.
First, calculate the equivalent resistance of the two resistors in parallel (6...
Q.
State Ohm’s law. If a potential difference of 10 V is applied between the two...
A.
Ohm's Law states that the current (I) flowing through a conductor is...
Q.
Which energy is transformed to which energy in an electric motor? Why in domestic circuits,...
A.
In an electric motor, electrical energy is transformed into mechanical energy. Domestic...
Q.
The equivalent resistances of two conductors are 9 Ω and 2 Ω when they are...
A.
For Series: R1 + R2 = 9 or, R1 = 9 -...
Q.
If 5 ampere current is conducted for 30 seconds through any conductor then the total...
A.
(b) 150 coulomb Explanation The total charge (Q) is given by Q...
Q.
An electric current is flowing through a wire. If in this situation the wire is...
A.
(b) will decrease Explanation When the wire is stretched, its length increases...
Q.
Mention any two advantages of using alternating current over direct current. Why is hydroelectric power...
A.
Two advantages of AC over DC AC voltage can be easily increased...
Q.
What is DC?
A.
DC (Direct Current) is a type of electric current that flows in...
Q.
If two conductor wires of resistances 6 ohms and 4 ohms are connected in parallel...
A.
For parallel Combination: = + or, = + or, = or, Req...
Q.
Give the definition of electromotive force of an electric cell in open circuit.
A.
The electromotive force (emf) of an electric cell in an open circuit...