Question

Please solve 5 and 6 with workouts..........​

Answer 1

Answer:

6th ans is television consumes more energy

Answer 2

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1. Power = P = 100 W

Voltage = V = 220v

Resistance = R

P = V²/R

100 = 220 ×220/R

R  = 220 × 220/100

     = 484 Ω

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Power = P = 60 W

Voltage = V = 220v

Resistance = R

P = V²/R

60 = 220 × 220/R

R = 220× 220/60

    = 806.7 Ω

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As the resistors are connected in parallel , 

total resistance = 1/R

1/R = 1/484 + 1/806.7

      =  806.7 + 484/484×806.7

      = 1290.7/390442.8

R = 390442.8/ 1290.7 = 302.5 ohms

    

  Total resistance = 302.5 Ω

I = current

V = IR

220 = I × 302.5

I = 220/302.5

   = 0.73 A

The current drawn is 0.73 A

2. For T.V set Power (P) = 250w, Time (t) = 1hr=60×60=3600s

for toster

power=1200W

time =10min = 10*60 =600s

E=P*T

Energy consumed by the TVset = 250*3600 =9*105J ∴ Energy consumed by a toaster = 1200 × 600 = 7.2× 105J ∴ the energy consumed by a 250 W TV set in 1 h is more than the energyconsumed by a toaster of power 1200 W in 10 minutes