I was surprised by this question in my physics exam. The question seems flawed to me:

**Stephen has designed a lighting circuit which includes a 48 Ω resistor. Calculate the number of 100W globes that can be used in series across 240V simultaneously before overloading the circuit and blowing the fuse.**

The correct answer was as follows:

```
Find the total current of the circuit:
I (total) = V / R
          = 240V / 48Ω
          = 5A

Find current of single globe:
I = P / V
I = 100W / 240V
I = 0.417A

Find maximum number of globes:
Number of globes = 5 / 0.417 (Total current / current through single globe)
                 = 11.99
∴ The circuit can support 11 globes before the fuse blows

```

Would I be correct in saying the problem lies with the calculation of total current? The total current should equal the total voltage divided by total resistance, however the calculation does not account for the globes in series and only for the 48Ω resistor. Another problem that seems apparent to me is no reference to what current the fuse can support. Am I correct in saying that total current changes based on how many globes are in series, and that it is no reference what so ever to when the fuse will blow?

My teacher has assured me this answer is correct, however I'm still confused by the concept.
Thanks in advance for your help.