Electrical efficiency

I assume from earlier you have the power of the solar cell?You have: the power of the solar cell, the size of the solar cell, the incident light per m^2,You want: the efficiency, or $\dfrac{\text{power in}}{\text{power out}}$

I haven't read the question, however, if that's just normal power efficiency you're mistaken, switch it up.

woops, fixed.

can't get the % sign to work in LaTeX

use \%

$percent sign = \%$

I assume from earlier you have the power of the solar cell?

You have: the power of the solar cell, the size of the solar cell, the incident light per m^2,

You want: the efficiency, or $\dfrac{\text{useful power out}}{\text{total power in}} \times 100 \%$

Got it cheers

Do you mind helping me with another thing. I was looking through the spec and didn't understand how to do this?

describe an experiment to obtain the I–Vcharacteristics of a resistor at constanttemperature, filament lamp and light-emittingdiode (LED).

Would be appreciated if you could tell me what the circuits were? Thanks

For I-V characteristics you just need a simple circuit with
(a)some method of varying the voltage
(b)an ammeter in series with the component
(c)a voltmeter in parallel with the component

I'm not sure whether we're allowed to just say a variable power supply to be honest, or whether we have to use a potential divider to vary the voltage. In the former case it's a really easy set-up, in the latter I'll have to draw a really bad picture on paint...

I was thinking it was just that. Care to send me a bad picture from pain . Thanks

I think you want this:

but I'm sure someone will tell me if I've drawn that wrong

Is that a resistor as well. What does the arrow represent?

Have some initiative, you've expended 0 brain power so far.

Have some initiative, you've expended 0 brain power so far.

I'm taking this as confirmation that I drew the potentiometer setup correctly.