1.3 Electricity in the home + Calc

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Hello 3 TVS!

Slide 1 - Diapositive

a little exercize to warm up!
Quantity
Abbreviation for Quantity
Unit
Abbreviation for Unit
Distance
s
Meter
m
Power
Voltage
?
?
?
Current
?
?
?

Slide 2 - Diapositive

a little exercize to warm up!
Quantity
Abbreviation for Quantity
Unit
Abbreviation for Unit
Distance
s
Meters
m
Power
P
Watt
W
Voltage
U (Unterschied)
Volt
V
Current
I (for Intensité)
Ampère
A

Slide 3 - Diapositive

Today
- Some theory
- Question form using a cool application!
- Discussing our findings 
- Summary

- Time for homework

Slide 4 - Diapositive

Some theory
Remember Power(in Watts)?


The power of a battery is the amount of energy it puts out per second.

E = P x t,   so P = E/t

Slide 5 - Diapositive

How does this connect to electrical circuitry? 

Power is relative to the Current and Voltage of electricity

If the voltage is higher, the amount of energy used up per second is ???
If the current is stronger, the amount of energy used up per second is ???


Slide 6 - Diapositive

The relationship between power, voltage and current is....


P = U x I

Slide 7 - Diapositive

Example question
If a battery has the Power to put out 3 W per second,
How much Energy did it put out if you run it for 3 minutes?


How do you solve a question like this?


Slide 8 - Diapositive

What do we know?                P = 3 W           t = 3 m = 180 s
What do we need?                E  = .........

E = P x t                                     E = 3 x 180 = 540 J

Slide 9 - Diapositive

Example
If a battery has a power output of 5 W and the circuit has voltage of 2 V. Calculate the Current running through the circuit.

Slide 10 - Diapositive

What do we know?                       P = 5 W        U = 2 V
What do we need?                       I = ...............

P = U x I                                            5 = 2  x  I                I = 5 : 2 = 2,5 A

Slide 11 - Diapositive

The total Power used in a system can be calculated!
;l



If a camera needs three batteries that output 22.5 Watts. 
What is the total Power that is needed for the camera to work?
22.5 + 22.5 + 22.5 = 67.5 Watts

Slide 12 - Diapositive

Question form
s




Afterwards, make your homework 1 through 9  for 1.3
but not 2bc, 3, 7c and 8
timer
30:00

Slide 13 - Diapositive

Discussing the answers you've found


Part one
T F T F F


Slide 14 - Diapositive

Part two(1)
It could be yes because all electronics in your house are in parallel so everything is running on 230 Volts.

It could be no because lightbulbs and electronics have different resistances. The amount of electricity running and powering a washing machine, is not the same as the electricity running a television, and this also counts for different types of lamps.

Slide 15 - Diapositive

Part two(2)
Stays the same
Lower
Higher Voltage/More batteries

Slide 16 - Diapositive

Summary time...

Slide 17 - Diapositive

Homework time!
make your homework 1 through 9 for 1.3
but not 2bc, 3, 7c and 8

Slide 18 - Diapositive