Because number of electrons remain same in the closed circuit or wire, due to conservation of charge in any case. But due to addition of a external resistor current will decreases, by applying ohm's law( V=IR).
♥ C) 94% ♥ If the work put into a lever is 930 joules and the work accomplished is 870 joules, the efficiency of the lever is 94%. ♥ <span>870/930=93.5 </span>♥ And rounded you get 94.
