Unit 114 'electron theory'

What is electricity simply the movement of?

• Protons carrying energy

• Atoms transferring charge

• Electrons carrying energy

• Molecules creating light

What can electrons transfer as they move along a conductor?

• Only electrical charge

• Only heat

• Some of their energy into other forms such as heat, light or movement

• Only light

What do all electrical devices like light bulbs, televisions, and phones have in common regarding their operation?

• They use different power sources

• They operate without using electrons

• They all harness the movement of electrons to do work

• They create energy independently

What does conventional current assume in terms of the direction of current flow?

• Current flows from the negative terminal to the positive terminal through the circuit.

• Current flows out of the positive terminal, through the circuit, and into the negative terminal of the source.

• Current does not flow through the circuit; it only flows within the source.

• Current flows in a random direction, independent of the terminals.

What actually happens in electron flow?

• Electrons flow from the positive terminal to the negative terminal through the circuit.

• Electrons flow out of the negative terminal, through the circuit, and into the positive terminal of the source.

• Electrons do not flow through the circuit; they only move within the source.

• Electrons flow in a random direction, independent of the terminals.

What type of current always flows in the same direction?

• Alternating current (AC)

• Direct current (DC)

• Static current

• Variable current

What is the type of current you get from the power company?

• Direct current (DC)

• Alternating current (AC)

• Static current

• Battery current

In an AC circuit, how does the current behave?

• It flows in one direction only

• It diminishes over time

• It reverses direction periodically

• It increases in strength

What is the simplest atom?

• Oxygen

• Carbon

• Hydrogen

• Nitrogen

What is the charge of an electron?

• Positive

• Neutral

• Negative

• Variable