Level 6 - The required formula - SPA

• physics
• Middelbare school
• havo
• Leerjaar 3

Level 6 - The required formula - SPA

Working:

- formula

- solution

Level 6 - The required formula - SPA

We gave ourselves plenty of hints that function as a foundation for solving our problem! Now, you should be able to work out the solution! Afterwards, we will check if our answer is possible and with the right unit.

Lets solve the problems! Use the determined 'given' and 'required' variables from level 5. Use pen and paper!

A curling iron is connected to a 230 V socket and uses 4 A of current.
What is the power rating of the curling iron?
(don't forget the unit)

1. What was the unit for the required variable in the problem you just solved?
2. Is the solution you got possible?
3. Why do you think it is possible?

A household consumes 5 kWh in a total time of 20 hours.

What is the total power the household is using?

1. What was the unit for the required variable in the problem you just solved?
2. Is the solution you got possible?
3. Why do you think it is possible?

My laptop has a power rating of 40 W and I used it last schoolday for 600 seconds.

How much energy measured in Ws did my laptop consume?

1. What was the unit for the required variable in the problem you just solved?
2. Is the solution you got possible?
3. Why do you think it is possible?

My charger transforms the voltage of the socket(!!, how many volts?) to a smaller voltage of 46 V. For this, it uses a primary coil of 100 turns.

How many turns has the secondary coil?

1. What was the unit for the required variable in the problem you just solved?
2. Is the solution you got possible?
3. Why do you think it is possible?

Congratulations!!!

You have passed 

Level 6 - The required formula - SPA