Middle School

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A 15-ohm resistor and a 25-ohm resistor are connected in parallel to a 60-volt battery. What is the power used by each device?

Answer :

25 ohm resistor

E = I * R General formula

  • E = 60 volts Givens
  • R = 25 ohms

60 = I * 25 Divide by 25

60/25 = I*25/25

2.4 = I

P = E * I

E = 60 volts

I = 2.4 amps

P = 60*2.4

P = 144 watts. Answer: 25 ohm Resistor

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15 Ohm Resistor

E = I R

  • E = 60 volts
  • R = 15 ohms

I = ??

60 = I * 15 Substitute

60/15= I * 15/15 Divide by 15

I = 4

P = E * I

  • E = 60
  • I = 4

P = 60 * 4

P = 240 Watts. Answer: 15 ohm resistor

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