Question

please answer quickly ​

Answer 1

17.

Rs = R1+R2 = 25Ω + 15Ω = 40Ω

1/Rp = 1/Rs + 1/40

=>1/40+1/40

=>2/40

=>1/20

So, Rp = 20Ω

c. 20Ω

18. b.Watt

19. Electrical heater = 2kW

Time = 3hr

Energy consumed = 2×3 = 6kWh

Cost = 6× 4 = Rs24

a.Rs24

20. a. kWh

21.

Power = 100W

Time = 1 minute =60s

Energy = Power × Time

=>100×60

=>6000J

a) 6000J

22. We know,

P = VIt

that's P is directly proportional to V

If V is halved

then, P also gets halved

a)1/2 times

23. a) Nichrome

24. d)I²Rt

By the formula

H = I²Rt {this is Joule law of heating}

Cheers!