Solving Resistance of a Wire: 21V Across 32m, 18m?

[john216]

Homework Statement

Suppose that a 32-meter length of resistive wire is connected across the terminals of a battery. If a voltmeter reads 21 V when connected across the battery terminals, what should it read when connected across a 18-meter section of the wire? Enter you answers using one decimal place, do not enter units.

Homework Equations

e = iR

The Attempt at a Solution

thought the voltage doesn't change.
but I think its wrong. Please help?

 

[SammyS]

Homework Statement

Suppose that a 32-meter length of resistive wire is connected across the terminals of a battery. If a voltmeter reads 21 V when connected across the battery terminals, what should it read when connected across a 18-meter section of the wire? Enter you answers using one decimal place, do not enter units.

Homework Equations

e = iR

The Attempt at a Solution

thought the voltage doesn't change.
but I think its wrong. Please help?

Hello john216. Welcome to PF !

Think of this as 32 one-meter lengths of wire connected in series.

What is the voltage drop across anyone of those one-meter wires ?

How much across 18 of them ?

 

[john216]

could you clarify little?
i'm confused

 

[SammyS]

could you clarify little?
I'm confused

It's hard for me to know what part/parts of what I posted confuses you.

What do you understand about series circuits and resistances in series?

What do you understand about voltage drop and Ohm's Law?

etc.