Chemical effects of electrical current


The terminals of a battery are joined by a length of resistance wire. Which change, on its own will decrease the current through the battery?
(A) Connecting an identical wire in series with the first one.
(B) Covering the wire with plastic insulation.
© Using a shorter wire of the same material and same thickness.
(D) Using a thicker wire of the same material and same length.


Current will decrease as resistance increases.

R = ϼ L / A (ϼ is Resistivity, L is length, A is cross sectional area).

R increases as ϼ increases.
R increases as L increases.
R increases as A decreases.

By this logic, what do you think the answer should be? :wink: