11 (a)
12
2400W
240V
Heating
element
Figure 11.1
(0
State the power rating of the kettle in kilowatts.
(ii)
How many units of electric energy would the use in 4 hours when connected to a 240v mains?
(iii)the cost of electricity is 30n. how much does it cost
to use the kettle for four (4) hours?
(iv)
Calculate the current flowing through the element of the kettle
when in use.
(v)
Suggest the size of a fuse suitable for the plug of this electric kettle.

The frequencies refer to the sample data collected from a population of interest when performing a hypothesis test comparing two or more population proportions.

If an electric circuit is not grounded it is best to reach out and touch it to provide the ground a.true or b.false

People with normal vision cannot focus their eyes underwater if they aren't wearing a face mask or goggles and there is water in contact with their eyes. in a simplified model of the human eye, the aqueous and vitreous humors and the lens all have a refractive index of 1.40, and all the refraction occurs at the cornea, whose vertex is 2.60 cm from the retina.with the simplified model of the eye, what corrective lens (specified by focal length as measured in air) would be needed to enable a person underwater to focus an infinitely distant object? (be careful-the focal length of a lens underwater is not the same as in air! assume that the corrective lens has a refractive index of 1.62 and that the lens is used in eyeglasses, not goggles, so there is water on both sides of the lens. assume that the eyeglasses are 2.05cm in front of the eye.)