a 30 w bulb is used for 1 hour. if it produces 56000j of light energy, what is the bulb's efficiency
energy, what is the bulb’s efficiency?
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The bulb is not ohmic, must use "P=VI" for the first part. When a light bulb is connected to the simple circuit shown, it dissipates a power of 60.0 W. (a) Determine the possible values for the current in the circuit. (b) Suppose that the values of the resistor's resistance is varied without changing the bulb's rate of energy dissipation. What is the maximum resistance? (c) If instead the battery's terminal potential is varied without affecting the bulb's power, what...
6. A light bulb is connected to a 40 V battery, as shown in the circuit below. If the power used by the light bulb is 22 W, what is the bulb's resistance? E = 40 V R = ? A B C D E 2.04 2 0.55 22 0.037 32 72.722 0.014 22
The operating potential difference of a light bulb is 120 V. The power rating of the bulb is 90 W. (a) Find the current in the bulb. A (b) Find the bulb's resistance.
Your eye is 2.5 m away from a 60W light bulb that emits light in all directions. 5.0% of the bulb's power is converted into light. What is the intensity of the light when it reaches your eye? (Surface area of a sphere of a radius, R is given by, A = 4piR^2) a. 2.3e5 W/m^2 b. 920 W/m^2 c. 0.77 W/m^2 d. 0.038 W/m^2 e. 0.00014 W/m^2
A watt is a unit of energy per unit time, and one watt (W) is equal to one joule per second (1 J s). A 80.0- W incandescent light bulb produces about 4.00% of its energy as visible light. Assuming that the light has an average wavelength of 510.0 nm, calculate how many such photons are emitted per second by a 80.0-W incandescent light bulb Number 1.03 x 1019 photons/s
The rms current through a light bulb is 0.466 A when the bulb is connected to a standard 120 V rms source. (a) Find the bulb's resistance. (b) Find the peak instantaneous current. (c) Find the peak instantaneous voltage. (d) Find the average electrical power used by the bulb.
3. [3 points] a) What is the current in a 12-22 toaster with a power output of 1200 W? b) Calculate the voltage needed to produce a current of 5A in a resistance of 40 22. c) A light bulb draws a current of 12A when connected to a 24-V battery. Find the bulb's resistance.
A light bulb is connected to a 120.0-V wall socket. The current in the bulb depends on the time t according to the relation I = (0.781 A) sin [(205 rad/s)t]. (a) What is the frequency of the alternating current? (b) Determine the resistance of the bulb's filament. (c) What is the average power delivered to the light bulb?
please help me with these 2 questions please all 2 please i need them please Exercise 25.46 14 of 21 Constants Consider the circuit of the figure (Figure 1). Part A 12 resistor? What is the total rate at which electrical energy is dissipated in the 5.0 Express your answer using two significant figures. IVO A20 ? Figure 1 of 1 > Submit Request Answer 1.6 12 16.0V w a b Part B 5.0 12 9.012 1.4 12 8.0V What...
Please make sure to answer A,B & C A light bulb is connected to a 120.0-V wall socket. The current in the bulb depends on the time t according to the relation I = (0.717 A) sin [(328 rad/s)t]. (a) What is the frequency of the alternating current? (b) Determine the resistance of the bulb's filament. (c) What is the average power delivered to the light bulb?