Current and Voltage Differences

Electricity, Current, Voltage

Multiple Choice

What part of the atom is moving to create electricity?

• Proton

• Electron

• Neutron

• Ice cream sandwich

Multiple Choice

What is an Ampere?

• The amount of electricity

• The amount of pressure on the electrons

• The amount of electrons moving across the wire per second.

So now let us imagine that you want to install a beautiful waterfall in your garden (also imagine that you are rich enough to have a big garden).

Multiple Choice

What does water need in order for it to flow?

• More of it

• Different temperature

• Ice

• A high and low part

Multiple Choice

If you want water to go from low potential energy to high you would need to add...

• A pump

• a boat

• a diving board

• A ramp

Let us connect up some wires to the bulb to try and make it light up. But sadly, we find that the bulb does not light up. We can see that the wire has electrons in it, but the bulb does not light up. Why is this ?

The reason that the bulb does not light up is that there is no “flow” of electrons. Electrons need to move in one direction to make the light bulb light up. If they just ‘hang around’ without moving in one direction, nothing happens.

Multiple Choice

T/F electrons can move randomly and still create electricity?

• True

• False

Open Ended

What could the cause of the potential difference in our circuit be? (like the water pump)

The blue dots are electrons the red dots are empty places for the electrons

Multiple Choice

What is the difference between a 1.5V and a 9v battery?

• 1.5 has a larger potential difference

• 9 has a larger potential difference

• The number only describes the size of the battery

• The number only describes how long the battery will last

Multiple Choice

What causes a light bulb to be brighter

• Current

• Voltage

• Resistance

Multiple Choice

Which math equation shows a directly proportional relationship between Current and Voltage

• V=current/resistance

• V=resistance/current

• V=Resistance/current^2

• V=current^2/resistance