Physics Core Questions: P2 - Electricity

Why do metals conduct electricity but plastics do not?

• Metals have delocalised electrons but insulators like plastics do not

• Plastics have more electrons than metals

• Metals are lighter than plastics

• Plastics are magnetic but metals are not

The structure of a metal is made of delocalised electrons and what else?

• positive metal ions

• neutrons

• negative non-metal ions

• covalent molecules

What is the charge of an electron?

• -1

• 0

• +1

• +2

What is the symbol for charge?

• Q

• V

• I

• R

What is the unit for charge?

• Coulomb, C

• Ampere, A

• Volt, V

• Ohm, Ω

What is current?

• The rate of flow of charge

• The amount of energy stored in a battery

• The resistance offered by a conductor

• The potential difference between two points

What is the symbol for current?

• I

• V

• R

• Q

What is the unit for current?

• Amps, A

• Volts, V

• Ohms, Ω

• Watts, W

What is the word equation to calculate the total charge flowing down a wire?

• Charge = current x time

• Charge = voltage x resistance

• Charge = power x time

• Charge = energy x current

What is the symbol equation to calculate the total charge flowing down a wire?

• Q = It

• Q = Vt

• Q = IR

• Q = V/I