25 ResistorsResistor – a device used in a circuit to limit current flow or provide a potential drop.PictureSymbol
26 Variable Resistor – a coil of resistance wire whose effective resistance can be varied by sliding a contact point.As more of the coil is used in the circuit, the resistance of the circuit increases, the current decreases.
33 What is a cell?A cell (wet or dry), a contained area that releases energy due to a chemical reaction.A cell stores charges.
34 How is a battery different from a cell? A battery is just two or more cells wired together.
35 What is the difference between a D and AA cell? Both cells do 1.5 J of work for each Coulomb of charge moved from one side to the otherHowever, a D cell stores more coulombs of charge, so it will last longer and do more work overall.