# Current magnitude

Discussion in 'Homework Help' started by sneha, Dec 11, 2006.

1. ### sneha Thread Starter New Member

Dec 11, 2006
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a resistor of 2ohms is connected to a cell,when the magnitude of current is i.if another resistor of resistance 2ohms is connected in series to resistor of 2ohms,the magnitude of current will be?

2. ### Dave Retired Moderator

Nov 17, 2003
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146

Given that the magnitude of the current: i = V/R

Then if R doubles from 2Ohms to 4Ohms (2Ohms + 2Ohms) and V remains constant, then the magnitude of the current will be i/2

Dave

3. ### sneha Thread Starter New Member

Dec 11, 2006
2
0
how come v remains the same in the above connection.

4. ### Dave Retired Moderator

Nov 17, 2003
6,960
146
Because your question does not specified that V changes therefore I assume it is constant. This is valid in this instance, but do try to avoid making assumptions when analysing circuits.

Note that if V does change then this will have an impact on the magnitude of i.

Dave