Question

Please answer the following question below based on the information and figure. I just need a description of which bulb will go brighter in each of the pictures. And any equations that would be necessary to explain this. It does not need to be worked out with numbers. Just the equations and words explaining how you can tell which glows brighter. Thanks! Below is also an example of how to set it up!

UQAWA - Electricity Spring 2019 Pictured is an incandescent bulb of X Watts and an incandescent bulb of 2X Watts connected in parallel (left image) and in series (right image); both batteries are the same 2X Using the basic principles of electrical circuits (Ohm's Law, Kirchhoff's Laws, Current, Resistance, Potential, etc.), write a UQAWA explaining which bulb will glow brighter in each of the arrangements indicated. Start by thinking about each bulb individually and what they'd look like if they were by themselves in a circuit with the same battery shown Recall that a UQAWA by its very nature is "qualitative." Therefore, while numerical values are unnecessary in the completion of the UQAWA, it does not exclude the inclusion of labeled figures and/or diagrams that accompany the discussion!! Finally, using terminology not actually covered in class clearly indicates that you've attempted to find the answer to the UQAWA without trying to really understand it. As such, any submissions that are evidently edited internet "finds" will not be graded!!

Answer 1

The 2X watt bulb will have less resistance than X watt bulb.

SO, in first combination, potential is same in both the cases, so the higher wattage bulb ie 2X watt bulb will glow more.

In the second case, thr current will be same for both the bulbs,

so power in X watt bulb = I2xR

Power in 2X watt bulb = I2xR/2

so, X watt bulb will glow more due to more power.