Class 7 Exam > Class 7 Notes > Science Class 7 > Worksheet: Electric Current and Its effects
Electric Current and Its effects Class 7 Worksheet Science Chapter 10
Q.1. True/False
(i) To make a battery of two cells, the negative terminal of one cell is connected to the negative terminal of the other cell.
(ii) When the electric current through the fuse exceeds a certain limit, the fuse wire melts and breaks.
(iii) An electromagnet does not attract a piece of iron.
(iv) An electric bell has an electromagnet.
Q.2. Fill in the blanks.
(i) Longer line in the symbol for a cell represents its ____ terminal.
(ii) The combination of two or more cells is called a ____.
(iii) When current is switched ‘on’ in a room heater, it ____.
(iv) The safety device based on the heating effect of electric current is called a ____.
Q.3. What is electric current?
Q.4. Who discovered magnetic effect of current?
Q.5. Which wire used in electric heater and why?
Q.6. Is it possible for a wire to melt and break? Why?
Q.7. Who invented electric bulb?
Q.8. Write some uses of battery.
Q.9. What is filament?
Q.10. What is the heating effect of the electric current?
Q.11. What are the uses of heating effect of electric current?
Q.12. Name any two effects of electric current.
Q.13. What is an electric circuit?
Q.14. Explain the symbol of electric cell.
Q.15. Why are fuse wires not used in circuit containing electric cell?
Q.16. Why a fused bulb does not glow?
Q.17. Why should we look for ISI mark on electrical appliances?
Q.18. We could not see element in electrical appliances. Give reason.
Q.19. Sometimes the cells are placed side by side. Then how are the terminals of the cells connected?
Q.20. On what factors does the heat produced in a wire depend?
You can find Worksheets Solutions here: Worksheet Solutions: Electric Current and Its effects
The document Electric Current and Its effects Class 7 Worksheet Science Chapter 10 is a part of the Class 7 Course Science Class 7.
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FAQs on Electric Current and Its effects Class 7 Worksheet Science Chapter 10
| 1. What is electric current and how is it measured? |  |
Ans. Electric current is the flow of electric charge in a circuit. It is measured in units called amperes (A), using a device called an ammeter. An ammeter is connected in series with the circuit and measures the amount of current passing through it.
| 2. What are the effects of electric current on the human body? | |
Ans. Electric current can have various effects on the human body, depending on the magnitude and duration of the current. It can cause muscle contractions, burns, injuries to the nervous system, and even cardiac arrest. The severity of the effects depends on factors such as the pathway of the current through the body and the resistance of the body.
| 3. How does an electric circuit work? | |
Ans. An electric circuit is a closed loop through which electric current flows. It consists of a power source (such as a battery or a generator), conductive wires, and various components (such as resistors, capacitors, and switches). When the circuit is closed, the power source provides the voltage that drives the current through the wires and components, allowing the flow of electric charge.
| 4. What is the difference between direct current (DC) and alternating current (AC)? | |
Ans. Direct current (DC) is the type of current where the flow of electric charge is unidirectional, meaning it flows in only one direction. It is commonly produced by batteries. On the other hand, alternating current (AC) is the type of current where the flow of electric charge periodically changes direction. It is the type of current supplied by most power grids. AC is advantageous for long-distance transmission as it can easily be transformed to different voltages.
| 5. How does electric current produce different effects in different devices? | |
Ans. Electric current produces different effects in different devices based on their design and components. For example, in a resistor, the current causes the heating of the resistor due to the resistance, while in an electric motor, the current produces a magnetic field that interacts with other magnetic fields to generate motion. The specific effects depend on the principles and properties of the components used in the device.
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