Physics Electricity Resistance increases.... (20 marks)

Voltage mean potential diff.(正charges跟負charge的差數)
R increased ,即係要花的charge 多左
但current 不變,即每一刻流過R的charges 不變
所以便會提高p.d,即V

有錯請指點

As：pigandrew3 said, when the current is the same and the resistance increases, so the voltage is required to be higher.

In fact, i think, the order is
" When R increases, the Voltage must increase in order to keep the same value of current. "

As you buy a battery, you just can see the Voltage Value on the surface, not the current value, right.

For example, if you use a power source(maybe a battery) which voltage is V and a Resistor which resistence value is R and use them to build DC circuit.

so the current value is I=V/R, if you buy another resistor and put them as series circuit.
the I=V/2R. In that situation, if you want keep the same current value, you must buy another battery to keep the same current.