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# Learn Unit IV: Effects of Current with Free Lessons & Tips

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Asked on 23/12/2021 Learn Unit IV: Effects of Current

1. Name the unit of (a) electrical resistance (b) resistivity

Asked on 23/12/2021 Learn Unit IV: Effects of Current

2. Define One Ohm

Asked on 23/12/2021 Learn Unit IV: Effects of Current

3. Define Resistivity

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Asked on 23/12/2021 Learn Unit IV: Effects of Current

11. What connection is used in domestic appliances and why?

Asked on 23/12/2021 Learn Unit IV: Effects of Current

12. A 250 watt electric bulb is lighted for 5 hours daily and four 6 watt bulbs are lighted for 4.5 hours... read more
12. A 250 watt electric bulb is lighted for 5 hours daily and four 6 watt bulbs are lighted for 4.5 hours daily. Calculate the energy consumed (in kWh) in the month of February. read less

Asked on 23/12/2021 Learn Unit IV: Effects of Current

13. A torch bulb is rated at 3V and 600mA. Calculate it s (a) Power b) Resistance c) Energy consumed... read more
13. A torch bulb is rated at 3V and 600mA. Calculate it’s (a) Power b) Resistance c) Energy consumed if it is lighted for 4 Hrs. read less

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Asked on 23/12/2021 Learn Unit IV: Effects of Current

14. State and derive joule s law. An electric iron consumes energy at rate of 420w when heating is at... read more
14. State and derive joule’s law. An electric iron consumes energy at rate of 420w when heating is at maximum rate and 180 w when heating is at minimum. The voltage is 220V .What is the current and resistant in each case? read less

a. Magnitude of electric current in the wire is increased

b. The compass needle is displayed away from the wire. (CBSE (CCE) 2012)

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7. Explain the role of fuse in series with any electrical appliance in an electric circuit. Why should... read more
7. Explain the role of fuse in series with any electrical appliance in an electric circuit. Why should a fuse with defined rating for an electric circuit not be replaced by one with a larger rating? (CBSE (CCE) 2011) read less

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