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FAQs on Infographics 2: Electric Current and Its Effects.. - Science Class 7 (Old NCERT)

1. What is electric current and how is it measured?
Ans. Electric current is the flow of electric charge, typically measured in amperes (A). It represents the movement of electrons through a conductor, such as a wire. The most common way to measure electric current is with an ammeter, which is connected in series with the circuit to measure the flow of electrons.
2. What are the effects of electric current on materials?
Ans. Electric current can produce several effects on materials, including heating, magnetic effects, and chemical reactions. For instance, when current flows through a resistor, it generates heat due to resistance. Additionally, electric current passing through a wire can create a magnetic field around it, and in electrolytic solutions, it can cause chemical reactions like electrolysis.
3. What is the difference between direct current (DC) and alternating current (AC)?
Ans. Direct current (DC) is a type of electric current that flows in one direction only, while alternating current (AC) reverses its direction periodically. DC is commonly used in batteries and electronic devices, whereas AC is used for powering homes and businesses because it can be easily transformed to different voltages.
4. How does electric current affect the human body?
Ans. Electric current can have harmful effects on the human body, depending on its strength and duration of exposure. Even small currents can cause a tingling sensation, while larger currents can lead to muscle contractions, burns, or even fatal electric shocks. The severity of the effect also depends on the path the current takes through the body.
5. What safety measures should be taken when working with electric current?
Ans. When working with electric current, it's essential to follow safety measures such as wearing insulated gloves, using tools with insulated handles, and ensuring that the work area is dry. Additionally, always turn off power before working on electrical circuits and use circuit breakers or fuses to prevent overloads.
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