- #1

VitaminK

- 46

- 4

- Homework Statement
- Find the expression for Power in a Circuit with two light bulbs ( each with resistance R) in series. The terminal voltage is V.

- Relevant Equations
- Req= R1+ R2

P=V^2/R

I was wondering if someone could check my answer and see if it is correct.

The resistance in series is Req= R+ R= 2R

The voltage across 2R is the terminal voltage V. The expression I get is:

Can I also use this formula P=I^2*R?

When using it I get:

Current through the resistors is

The resistance in series is Req= R+ R= 2R

The Power is:

However i don't get the same answer :(

The resistance in series is Req= R+ R= 2R

The voltage across 2R is the terminal voltage V. The expression I get is:

Can I also use this formula P=I^2*R?

When using it I get:

Current through the resistors is

The resistance in series is Req= R+ R= 2R

The Power is:

However i don't get the same answer :(