Physics - electricity

An incandescent lamp is marked '120v,75W'

a)what is the current in the lamp under normal condition of operation?

b)How much does it cost per hour to operate the lamp if the price of electrical energy is $6.00 per unit?

Please stop posting under different names.


Use ohms law, remembering Power is I*V

Cost= power*time

  1. 👍 0
  2. 👎 0
  3. 👁 133
  1. a. P = E*I = 75W
    120I = 75
    I = 0.625A

    1. 👍 0
    2. 👎 0
    posted by Henry

Respond to this Question

First Name

Your Response

Similar Questions

  1. Physics

    A 100 W lamp is connected to 120 V, and its current is measured. A resistor is added to the lamp to reduce the current to half its original value. (a) What is the potential difference across the lamp? (b) How much resistance was

    asked by Billy on April 14, 2013
  2. ipc

    investigate and compare economic and environmental impacts of incandescent light bulbs versus the various fluorescent lamps, solar lamp, and oil burning lamp or candles.

    asked by poo on April 13, 2011
  3. Physical Science

    Turn an incandescent lamp on and off quickly while you are standing near it. You feel it's heat, but you find when you touch the bulb that it is not hot. Explain why you felt the heat from the lamp?

    asked by Rachel on March 10, 2008
  4. physics

    A lamp operates with a current of 0.625A and a potential difference of 120V. What is the currnt flowing through the microwave?

    asked by chantel on May 3, 2008
  5. Chemistry

    Describe the spectrum of the light from a fluorescent lamp and from an incandescent (tungsten filament) lamp, and try to explain what you observe. So fluorescent lamps use electricity to excite mercury vapour, and the excited

    asked by Jon on December 5, 2010
  6. Physic

    A lamp filament is made of tungsten. Why do we get a continuous spectrum rather than a tungsten line spectrum when light from an incandescent lamp is viewed with a spectroscope?

    asked by shelly on December 11, 2012
  7. Physics

    A lamp fimament is made of tungsten. Why do we get a continuous spectrum rather than a tungsten line spectrum when light from an incandescent lamp is viewed with a spectroscope?

    asked by Leigh on March 27, 2008
  8. physics

    A 37 ohm lamp and a 59 ohm lamp are connected in series and placed across a potential of 43 V. What is the equivalent resistance of the circuit? What is the current in the circuit? Answer in units of A. What is the voltage drop

    asked by Leslie on April 27, 2011
  9. electronics and circuits

    A battery in combination with a dependent current source is connected to a lamp in the circuit shown below in Figure 6-1. The battery is modeled as a voltage source in series with a resistor, Rbat, and has an open circuit voltage

    asked by kanimozhi on November 18, 2016
  10. science

    An electric lamp rated at 48w,12-v supply. Calculate the current flowing in the lamp and the resistance

    asked by wisdom Andrew on February 26, 2016

More Similar Questions