2500 w
1800 w
2.8 kw
a student investigated how the power output of a kettle affected the time taken to boil a fixed
volume of water.
the water in all three kettles had an initial temperature of 25 °c.
(b)
what type of variable was the time?
tick one box
control
000
dependent
independent

Difference between series and parallel circuits

Amajor difference radio waves, visible light, and gamma rays is the of the photons, which results in different photon frequencies and wavelengths

Cells in the nervous system have a potential difference of 70 mv across the cell membrane separating the interior of the cell from the extracellular fluid. this potential difference is maintained by ion pumps that move charged ions across the membrane. is this an emf? select the correct answer and explanation. 1)no. the ion pumps cannot separate charges; thus, they cannot create a potential difference. 2)yes. the ion pumps cannot separate charges, but they still can create a potential difference. 3)yes. the ion pumps can actively separate charge; thus, they can create a potential difference. 4)no. the ion pumps can separate charges, but they cannot create a potential difference.