# How Six 2V lamps could be lit to their normal brightness.

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1. Nov 17, 2015

### Meezus

1. The problem statement, all variables and given/known data

2. Relevant equations

3. The attempt at a solution

I'm not really sure how to attempt this question tbh. In order for the lamps to have normal brightness I think the circuit must be parallel. I also think maybe for A there can only be one lamp per branch because there's only 2V available, for B there can be 3 per row and for C it can just be series?

2. Nov 17, 2015

### stockzahn

Your attempt seems to be correct.

3. Nov 17, 2015

### Meezus

Thank you :D I guess I did know haha. Any chance you could help with this?

a) I know how to draw the circuit.
b) I'm completely stuck on B. I'm guessing it involves omhs law but I can't see where.
c) I can answer C with Potential difference (V) = current (I) x resistance (R).
d) I'm not sure how to work out this.

4. Nov 17, 2015

### haruspex

What is the p.d. across X?

5. Nov 17, 2015

### Meezus

Potential difference (V) = current (I) x resistance (R)

Potential difference (V) = 2 x Resistor X?

6. Nov 17, 2015

### stockzahn

Yes, we'd like to help you with this, but at first please start a new thread with this problem. According to the forum rules only one problem should be discussed in each thread.

7. Nov 17, 2015

### Meezus

8. Nov 17, 2015