OCR Physics Unit 2 - G482 - (June Exams Preparation) Watch
For kWh question, it measures price of power used by the charger, nothing to do with effective power. Power drawn from supply is 3600W which is 3.6kW. So 3.6 x 7 x 26 = 655.2p which rounds to 660p
Ohhh yes that makes sense
Damn I really screwed up on this paper :s
Could I still get 1 mark for the question about cost since I used wrong power(about720W) to instead of 3.6KW ?? I wrote 0.72x7x26......
If it hadn't been, we could've got a method mark for that since we both applied the correct formula, just the wrong value. Never mind
And also for the LDR question, it was a voltmeter right?
And what did you put for the sensible max value? I put 15 because that was the value when the LDR had the greatest resistance.
I calculated the values for the wavelength and everything
ETA: sorry, misread your post.
Kirchhoff's 1st law and quantity conserved (2marks)
Kircchoff's 2nd law and quantity conserved (2marks)
Current in 750Ω resistor. (0.003-0.001=0.002) (1mark)
V across 750Ω resistor. (0.002x750=1.5V) (1mark)
Resistance in two resistors.(1000Ω, 1500Ω) (2marks)