CBSE Class 7 Science Electric Current and its Effects Worksheet with Solution by Expert Science Mam. Students of 7th Grade can solve this worksheet for extra preparation before exam. Private Teacher or Guardians of the Students can copy all the questions of this chapter and will match after solve their students.
Electric Current and its Effects Class 7 Worksheet
Worksheet for Chapter No.14): – Electric Current and its Effects
The following questions are important for your exams for 1 mark 2 mark or 5 marks. First solve the questions on your own and then saw the solution for understanding it better.
Practice worksheet for class 7
Section A
Q.1.) What is the definition of battery and which devices use it?
→ The positive terminal of one cell is connected to the negative terminal of the next sale such a combination of two or more cell is called as a battery. Many devices like torchlight, transistors , toys, TV remote controls use batteries.
Q.2.) Write any two effects of electric current?
→ 1.) Electric current converts a straight conductor into a temporary magnet
2.) Electric current gives rise to heating and lighting.
Q.3.) What is electric charge and what is the SI unit of it?
→ Electric charge gives define as special kind of force exerted when an object kept in under the influence of electromagnetic field. The SI unit of electric charge is coulomb.
Q.4.) What do you mean by electromagnet?
→ An electromagnet is a type of a magnet in which the magnetic field is produced by an electric current.
Q.5.) What are the uses of electricity?
→ 1.) Electricity use for lighting the rooms with the electric bulbs are tube lights.
2.) Used in electronic gadgets
3.) It has wide variety of use in healthcare industry and medical industry.
Q.6.) What is heating effect of electric current?
→ Production of heat in an electric device due to the flow of electric current is called as the heating effect of electric current.
Q.7.) How resistance of wire depends on heating effect of electric current?
→ Greater the resistance of a wire greater will be the heat produced in it by a given current.
Q.8.) Write two applications of heating effect of current?
→ 1.) For the production of light, the heating effect of electric current is utilized in an electric devices like bulb.
2.) For the working of electrical heating appliances like water heater and electric iron.
3.) The heating effect of electric current utilized in safety device called as electric fuse.
Q.9.) What do you mean by electric fuse?
→ A safety device which works on the heating effect of a current and prevents electric fires or a damage to electric appliance due to excessive flow of current is known as the fuse.
Q.10.) We cannot use thick wire as a fuse. Explain?
→ We should not use thick wire as a fuse because it will have low resistance and therefore it will not get heated to its melting point when a large current is passed through a circuit.
Q.11.) What do you mean by overloading ?
→ When too many electrical devices connected to a single socket, they draw an extremely large amount of current from the circuit. The flow of large current due to overloading may heat the copper wires of household wiring to a very high temperature and it can cause fire.
Q.12.) Explain magnetic effect of electric current?
→ If the electric current passes through a wire, then the current carrying wire behaves like a magnet this phenomenon is known as magnetic effect of a current. A straight wire carrying an electric current produces a magnetic effect. The magnetic effect is increased only if we use a long coil of wire instead of a straight wire.
Q.13.) What are the uses of electromagnets ?
→ 1.) For a deflecting electron beam of the picture tube of TV electromagnets are used.
2.) For preparing strong permanent magnets electromagnets are used.
3.) Used in electrical appliances like electric fan and electric motor etc.
Q.14.) Why do we use nichrome in an electrical heater?
→ Nichrome is an alloy having high resistivity. The melting point of nichrome is also very high so nichrome is used as coil in an electrical heater.
Q.15.) Is there any difference between a cell and a battery ?
→ Yes, cell is a device that create potential difference in the circuit to flow the current in the circuit whereas the combination of two or more cell in series is called as a battery.
Q.16.) Give the name for following?
→ 1.) Path of a electric current. – electric circuit
2.) Magnet produces an electricity. – electromagnet
3.) Device which creates potential difference in the circuit. – cell
4.) Combination of two or more cell. – battery
5.) Safety device that protects electrical appliances. – fuse
Q.17.) Complete the following table?
SR.NO. |
A | B |
1 | Electric Current |
Watt. |
2 |
Resistance | Joule |
3 | Power |
Ampere |
4 |
Energy | Ohm |
5 | Potential Difference |
Volt. |
→ 1) Ampere
2) Ohm
3) Watt.
4) Joule
5) Volt.