in my physics 202 class we have a test coming up and for the study guide our pro

Question

in my physics 202 class we have a test coming up and for the study guide our professor told us that one of our questions would have this information.

There is a light bulb

the light bulbs resitivity is given

the lightbulb connected to a voltage source for 1 hour and the voltage is given from this source

how much current is run through the bulb

how much power is sent through the bulb

and how much energy is consumed by the bulb.

can you provide an example or some way of solving this please and thank you for any help. you can fill in numbers where i said the information will be provided by the professor im just trying to figure out how to solve a problem like these.

if it helps the chapters this test covers is chapters 16-19 from the seventh edition physics book by douglas c giancoli

Explanation / Answer

Given
V = 200V

R = 10 ohms

t = 1hr

Formulae
V = IR ... ohm's law
P = VI .. power
W = P x t ... work or energy

Solution

I = V/R = 200/10 = 20A

P = VI = 200 x 20 = 4000 watts or 4 kW

W = Pt = 4 kWx 1hr = 4kWhr

** Sometimes they ask the energy in joules. To do so, convert as
1kWhr = 3600000 J

upvote if it helps

Related Questions

Navigate

• Browse (All)
• Browse I
• Subjects

Integrity-first tutoring: explanations and feedback only — we do not complete graded work. Learn more.