how do you calculate the power dissipated in a light bulb

by Art Abbott Published 3 years ago Updated 2 years ago

When the bulbs are connected in parallel, each bulb has 120 V across it, each draws 1/3 A, and each dissipates 40 watts. In this circuit, all bulbs glow at their full brightness. The total power dissipated in the circuit is three times 40, or 120 watts (or 3(1/3) A × 120 V = 120 W).

Full Answer

How do I find the power dissipation of a light bulb?

Calculate the power dissipated at bulb A and B respectively and determine which bulb is brighter. If I'm correct, Bulb A has 576 Ω and Bulb B 115.2 Ω but I'm stuck here. First, find resistance of each bulb. Use R=V^2/P, where P is power rating. Find series equivalent resistance. Add them.

How much power is dissipated by a 5 volt bulb?

That's what the rating of any device always means. For this much voltage, if this was the voltage across that device, then the power across that, power dissipated would be 50 watts. But clearly, in this example, the voltage across the bulb is not 10 volts, we can see it's 5 volts.

How to calculate the resistance of a light bulb?

To calculate resistance, we need connection between voltage, power, and resistance, and so just like before, we can use P equals V squared over R for this and for this, and if you do that, I leave that calculation to you, I don't want to waste space over here, but if you do that, we will see that this bulb has a resistance of two ohms.

How can I determine which bulb is brighter?

Calculate the power dissipated at bulb A and B respectively and determine which bulb is brighter. If I'm correct, Bulb A has 576 Ω and Bulb B 115.2 Ω but I'm stuck here.

How do you calculate the power dissipated in a bulb?

6:2712:51Solved example: Power dissipated in bulbs - YouTubeYouTubeStart of suggested clipEnd of suggested clipPower is v squared over r. That's going to be v squared v squared is 5 squared over r r is 2 ohms.MorePower is v squared over r. That's going to be v squared v squared is 5 squared over r r is 2 ohms.

How do you calculate power dissipated?

To find out, we need to be able to calculate the amount of power that the resistor will dissipate. If a current I flows through through a given element in your circuit, losing voltage V in the process, then the power dissipated by that circuit element is the product of that current and voltage: P = I × V.

What is the total dissipated power?

The total power dissipated will be equal to the sum of the power dissipated by each individual resistance. Depending on the values that are known, combinations of the power formula, as well as Ohm's law, can be used to calculate power dissipated (or any other unknown value).

What do you mean by power dissipated?

Power dissipation is the maximum power that the MOSFET can dissipate continuously under the specified thermal conditions. It is defined between channel (ch) - case (c) or ch - ambient air (a) when mounting an infinite heat sink.

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