- #1

- 40

- 3

- Homework Statement:
- I'm not sure what this symbol means

- Relevant Equations:
- V1 = R1 / R1+R2+R3 x "inverted 3"

Last edited by a moderator:

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- Thread starter ellieee
- Start date

- #1

- 40

- 3

- Homework Statement:
- I'm not sure what this symbol means

- Relevant Equations:
- V1 = R1 / R1+R2+R3 x "inverted 3"

Last edited by a moderator:

- #2

- 4

- 6

- #3

Steve4Physics

Homework Helper

Gold Member

- 532

- 382

I know I'm being pedantic but can I add:

1) It is ##\mathscr E## not an epsilon (##\epsilon##). The symbol is a 'script E'. My school physics teacher used to call it a 'curly E'. (To get the symbol with Latex, use \mathscr E.)

2) There is an important difference between the voltage (more correctly terminal pd), V, of a voltage-source and the source's emf ##\mathscr E##.

If the voltage-source has some internal resistance, then when a current flows V is smaller than ##\mathscr E##. But for an ideal voltage-source (zero internal resistance) V and ##\mathscr E## are the same value. Most simple circuit problems assume an ideal voltage-source; in that case you don't need to worry about the difference.

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