Table of Contents
Week 1 | KS3 Physics
Week 2 | KS3 Physics
Week 3 | KS3 Physics
Week 4| KS3 Physics
Week 5| KS3 Physics
Week 6| KS3 Physics
Week 7| KS3 Physics
- Current = flow of charge around a circuit. Only flows if a circuit is complete
- Moving charges = negative electrons, which flow in the opposite direction of conventional current (always positive to negative).
- CURRENT IS NOT USED UP. ALWAYS THE SAME.
- Battery acts like a pump in a circuit = provides the driving force to push the charge around the circuit. Driving force = potential difference
- Increase potential difference = more current flows
- Several batteries = bigger potential difference
- Potential difference = voltage
- Resistance = anything in a circuit which slows down current flow. Measured in ohms.
- RESISTANCE = POTENTIAL DIFFERENCE / CURRENT
- Potential difference same = higher resistance = smaller current
- Conductors = components and materials that electricity can easily travel through like metal
- Insulators = components and materials that don’t allow electric charges to pass through easily
- Lower resistance = better conductors
- Higher resistance = better insulator
How long have you…? (present perfect 4) Exercises
Use the information given to create questions beginning with ‘How long…?’
• It is snowing.
• The weather is shining.
• John and Kate are married.
• My brother has gone on holiday.
• My aunty and uncle live in Canada.
• My sister is a teacher.
• I work at the chemist.
• I’ve known Susan since I was a baby.
• Jonathan is learning to speak to Mandarin.
Fill in the missing gaps in the sentences using the present perfect (=has/have + past participle)
• I have known Kate a long time.
• My brother has been playing the piano he was 11 years old.
• My mum and dad on holiday to America. They
gone since last Sunday.
• I Ben and Emma since primary school.
We to the same primary and secondary school.
• My sister learning to speak French because she
is going to France next month.
have you lived lives to
has been works have known
I have bought have worked.
• My sister in Spain. She is studying Spanish
with her friend Rosie. I Rosie since I was 5.
• Spencer like with Jamie. They have worked
together for 2 years.
• How long in Australia?
• a new dress for prom.
• He to Thorpe park.
Challenge: Create 4 of your own questions beginning with ‘How long……?’