Year 9 cover work

• Physics
• Lower Secondary (Key Stage 3)

Year 9 cover work

What is the potential difference and how can we calculate it?

What is the unit of work done?

1. Joules
2. Jewels
3. Jewells
4. Joulles

Which part of a metal carries charge?

1. Neutrons
2. Protons
3. Electrons
4. Sea of delocalised particulates

Work done is equal to

1. Work not done
2. Energy transferred
3. Energy lost
4. Energy gained

Complete the equation
potential difference =
Energy / _______

1. Current
2. Columb
3. Carbon
4. Charge

What unit is commonly used to measure energy transfer?

1. Joules
2. Volts
3. Amps
4. Watts

In which unit is work done typically measured?

1. Seconds
2. Joules
3. Newtons
4. Meters

Compare contrast and explain the potential difference in the 2 circuits on the last slide

Compare contrast and explain the potential difference in the 2 circuits on the last slide

The plug of an electrical appliance contains a fuse. The mains PD is 230V. Calculate the energy transferred when 13C of charge flows.

Calculate the energy transferred if the charge is 75C and the voltage is 2.5V

Calculate the voltage when the current is 5A and resistance is 2.5Ohms

Calculate the voltage when the current is 10A and resistance is 0.2Ohms

Calculate the current when the potential difference is 20V and resistance is 10ohms

Calculate the current when the potential difference is 10V and resistance is 20Ohms

Calculate the current when the potential difference is 20V and resistance is 10 ohms

Calculate the resistance when the current is 15.5A and the potential difference is 5.5V

An electrical kettle uses mains voltage of 230V. The current is 10A. Calculate the resistance.

A light bulb with resistance 60 ohms is connected to a 12V battery. What is the current?

A hairdryer uses mains voltage (230V) It takes a current of 5A. Calculate the resistance.

A toy tractor has a 4.5V battery operated motor. The resistance of the motor is 15 Ohms. What is the current?

A portable CD player takes a 6V battery. The loudspeaker has a resistance of 4 Ohms. What is the maximum current through the loudspeaker?

What quantity does the ammeter measure?

The current in the circuit is 3.5mA when the potential difference across the thermistor is 4.2V.
Calculate the resistance of the thermistor.

Calculate the charge that flows through the thermistor in 5mins when the current is 3.5ma

Thinking about today's lesson. Which part did you find easy? Which part did you struggle with?