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28 May, 02:02

2. A 5 Ohm resistor is connected to a 9 Volt battery. How many Joules of thermal energy are produced in 7 minutes?

3. The current in a flashlight powered by 4.5 Volts is 0.5 A. What is the power delivered to the flashlight?

4. If the flashlight in the previous problem is left on for 3 minutes, how much electric energy is delivered to the bulb?

7. A 50 Ohm resistance causes a current of 5 milliamps to flow through a circuit connected to a battery. What is the power in the circuit?

8. How many Joules of electric energy are delivered to a 60 Watt lightbulb if the bulb is left on for 2.5 hours?

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Answers (1)
  1. 28 May, 04:39
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    2)

    power of an electric device = V² / R where V is volts and R is resistance

    putting given data

    power = 9² / 5

    = 16.2 J/s

    energy produced in 7 minutes

    = 16.2 x 7 x 60

    = 6804J.

    3) Power of an electrical device

    = V² / R

    = V X I where I is current

    = 4.5 x. 5

    = 2.25 W or J/s

    4)

    energy used in 3 minutes with power of 2.25 W

    = 2.25 x 3 x 60

    = 405 J.

    7)

    power of a electrical device

    = V x I

    IR x I where R is resistance.

    = I²R

    putting given data

    power =.005² x 50

    = 1.25 x 10⁻³ W.

    8)

    Energy used up by a 60 W bulb in 2.5 hours

    = 60 x 2.5 x 60 x 60

    = 5.4 x 10⁵ J.
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Home » Physics » 2. A 5 Ohm resistor is connected to a 9 Volt battery. How many Joules of thermal energy are produced in 7 minutes? 3. The current in a flashlight powered by 4.5 Volts is 0.5 A. What is the power delivered to the flashlight? 4.
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