Question

I'm making a house using christmas lightbulds and using a 1.5v. My teacher said I have to find V,I,R.
i DON'T KNOW WHAT TO DO.
I have two lights in series and three lights in parallel. And one light by itself

Answer 1

use a voltmeter and an ammeter

Answer 2

I don't have those

Answer 3

What are you trying to do?

Answer 4

It will be near impossible for you to get true values without a multimeter, however, you could look at the lamp rating for your christmas lights, add the number of lights up (assuming series connection) and then divide by your source voltage to get the circuit current.
A series circuit carries the same level of current to all elements, this will then allow you to again use ohms law to calculate the resistance each of the lamps has by dividing their wattage by a square of the current.

Answer 5

\[V=IR_\text{equiv}=I(2R)\]

Answer 6

Do you know the resistance of the globes ?

Answer 7

no

Answer 8

What information do you have?

Answer 9

my teacher didn't give enough information. He just told us to find E=9v for V I R

Answer 10

\( 1.5[\text V]\) or \( 9[\text V]\) ?

Answer 11

sorry I mean 1.5

Answer 12

the trick is that a 1.5B battery in reality doesn't give out exactly 1.5V

Answer 13

*1.5V battery