Find the false battery claim

Exercise and reference answers

Questions

1. False statement

   Emf is a genuine force and is measured in newtons.

   Statements

   1. Emf is the potential difference of a cell when no current flows.
   2. Terminal voltage is emf minus the current times internal resistance.
   3. Emf is a genuine force and is measured in newtons.

2. False statement

   A 12 V truck battery has more internal resistance than a 12 V bike one.

   Statements

   1. A 12 V truck battery has more internal resistance than a 12 V bike one.
   2. Internal resistance rises as a battery is depleted.
   3. Terminal voltage equals emf only when no current is flowing.

3. False statement

   Cells wired in series have their internal resistances cancel out.

   Statements

   1. Cells wired in series have their emfs add algebraically.
   2. Cells wired in series have their internal resistances cancel out.
   3. Two identical cells in parallel give the same emf but more current.

Instructions

One line in each set of three is false. Tap it.

Explanation