The sides of certain triangles are given below. Determine which of them are right triangles.

(iv) $a\ =\ 8\ cm,\ b\ =\ 10\ cm$ and $c\ =\ 6\ cm$

(iii) $a\ =\ 1.6\ cm,\ b\ =\ 3.8\ cm$ and $c\ =\ 4\ cm$

(ii) $a\ =\ 9\ cm,\ b\ =\ 16\ cm$ and $c\ =\ 18\ cm$

How much work is done in moving a charge of $2 \mathrm{C}$ across two points having a potential difference of $12 \mathrm{~V}$ ?

What is the SI unit of potential difference?

How much work is done when one coulomb charge moves against a potential difference of 1 volt?

What is meant by saying that the electric potential at a point is 1 volt?

(a) What do the letters p.d. stand for?

(b) Which device is used to measure p.d.?

By what other name is the unit joule/coulomb called?

(i) $a\ =\ 7\ cm,\ b\ =\ 24\ cm$ and $c\ =\ 25\ cm$

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