scinece test for baddies

Science notes

Power from energy and time:

kW•h/t(h) x1000

Question 9 type (Daily average usage)

• You know energy used (kWh) and power (W or kW).

• Step 1: Convert W → kW if needed

• Step 2: Divide kWh by kW → total weekly hours

• Step 3: Divide by 7 → daily hours

• Step 4 (optional): ×60 → daily minutes

Static electricity and charges:

If u touch a Long hair cat and then touch a metal doorknob what would happen?

• Neutral electrons

• Insulators/conductors

If you rub plastic wrap against glass what charge would it have?

Equations:

Majority of test is math

Slopes;electro

Whatever u touch and rub against a other object is a insulator

• Insulator rub insulator= 1 positive for the lower negative electron, 1 negative for the higher negative electron count

• Conductor rub conductor= no charge

Conductor is the victim that gets touched

• Draw diagrams of circuits

• Parallel vs series

First page

Scenarios

Ex you pet a cat, then touch a doorknob

What happens and why

Second page

Are the following negative positive or neutral Bottom half is electroscope

Ex it's positively charged, where will the gold foil

go

Third page

Calculations

Fourth page

Building circuits

Fifth page

One question abt the parallel circuits voltage and current

ME

And one question abt graphing

Why are metals good conductors

Insulators and conductor questions

•How/Why rubbing changes Material

Rubbing changes Matertials because it causes the transferring of electrons and static  change

Apply law of State Charge opposite charges attract, like charges reper, and charged

* Charging: Induction us Conduction

Induction: redistributing the chärges within an object caused by pect without direct contact, Conduction: direct transfer ot

electors by touch

• Recognize Symbols to draw a Circuit

Switches → →-

Parallel Circult

resistor TAW

• for hare lights

CEll

vittueter

bull _m2

Series Circuit

Ammeter

〒

- for suall, decorative

• Resistor Color Code

aghts

1. first too colors are the diges far the Ast factor 2. The third color's mulpier mukes up the Second factor 3, Multiply both factors, add unit symbol: 52, ald tolerance

• Graphing Voltage Vs. Current to find Resistance

Change in hetty (v)

(Slope)M = Change in Current (I)

= R (ReSiStAnce) 1. Picktive points,

Subtract voltege points

sustact current points. 2.=

Steeper: higher resistanct

• Series ind Parallel Circuits

Current| voltage, Resistancey Fallure

Series Cae Pary

one break dead

Parallel (Maltple path) / spit, I / Sale for decreases one brenkis only that branch

•KWhvs. Joules} Joules3kWh=kw(,000watts) xhour

*Both are energy (E)

Joule = Watt x secand

• Calculate Cost of Electricity

1. Find kwh (E=Pt) → kwh=kw•hr) 2 Cent/kwih = kwh-Cents

Apptiance: TV/ TV costs 15/kwih

[Pawer

Energy

200 Wedis

2 hrs

W=kw

1000

E= Pt

kwh= Kw-h

Kw-h= 0.2kw • 2h

kw-h= 0,4

0,4 kwh. 74 = 2.8¢

Columb: Unit of electric Change

Static Electricity: When different Materials rub together, the friction causes elections to jump, and the electric charge bustils up.

Matterials that pete tou

Voltage: potential difference, electrical pressure that Makes electrons move through wire.

Current: the continuous flow of electrons in wire Resistance: friction to the flow

Current Electroty: the contanous flow of electrons withd a conductor.

Voltueter: device that Measures voltage in a Circuit Amueter: device that measures current in a circuit resistor: controls the resistance, regulates the flow in a circuit

Ohmucter: device that wearures resistance

Milliampere: one thousandth of an Ampere (MA

= 4)

Battery: Stores chericat energy that is converted into

@ech1ca1

and

Electrodes are the two ends of the battery. There and day

wet batterils,

Pawer: energy transferred per tre interval

Colour resistors

Ex. Brown is 1 and blue is 2 =12

Pink is 10^4

12x10^4 = 120,000

Fourth colour is called the tolerance is percentage silver,gold

If there is no fourth colour is automatically 20%

Combine resistors numbers, third colour would be 10^ and it’s number would be the power

So it would for ex 12x10^4 = 120,000

• Van de graaf(produces static electricity)

• Electroscope (it detects electric charge”

• Static electric questions

• Friction questions

• Parallel vs series (current,resistance, voltage)

• Resistance, current, voltage definitions

• Slopes

• Kw•hx h=_

_x price