Electricity/Circuts

Question 1

What is Voltage

Answer 1

The amount of energy in the electrons before and after the source(battery)

Question 2

What is current

Answer 2

Current calculates how much charge flows from one spot to another

Question 3

What is resistance

Answer 3

Resistance is a measure of how much a substance prevents the flow of electrons

Question 4

What is a series circut

Answer 4

An electrical circut that only has one path for electrons to flow through

Question 5

What is a parallel circut

Answer 5

An electrical circut where there is more than one path for electrons to flow through

Question 6

What is static electricity

Answer 6

A stationary charge on an object, charges build up on the surface of an object and move randomly in all directions

Question 7

What is current electricity

Answer 7

Charges move through a conductor, a steady flow of electric charge in a controlled flow

Question 8

What is a conductor

Answer 8

A metal object that lets electrons flow through them and wants to loose electrons

Question 9

What is an insulator

Answer 9

A non metal object that wont let electrons flow through them and wants to get electrons and hold onto them

Question 10

What is charge by friction

Answer 10

When rubbing two objects together it provides the energy needed to move electrons from one object to another causing a charge to build up

Question 11

What is charge by contact

Answer 11

A charged object touches another object allowing electrons to transfer

Question 12

What is charge by induction

Answer 12

When a charged object does not touch the neutral object being charged

Question 13

What is charge by grounding

Answer 13

When an object is grounded and a charge is brought near, electrons move into or out of the ground

Question 14

What devices use static electricity

Answer 14

Spray painting cars, Static dusters, photocopier, Van de Graaff generator

Question 15

How do you use static electricity to paint cars

Answer 15

You make the car positively charged so you can use a negatively charges spray gun too spray the paint across the car and the paint spreads out evenly because the negative charge is attracted to the positive charged car

Question 16

How do you use static dusters

Answer 16

When you sweep the duster across an object it causing a buildup of charge on the duster, the dust is attracted to the static duster and “jumps” of of the surface onto the duster

Question 17

What are some ways to avoid charge

Answer 17

• grounding
• points
• humidity

Question 18

What are the 3 equations for calculating current, voltage, and resistance

Answer 18

V=IR
I=V/R
R=V/I

Question 19

what are the 4 factors that contributes to the resistance of a substance

Answer 19

1.Lengeth= the longer the wire the greater the resistance, the shorter the wire the smaller the resistance
2.Cross Sectional area= the larger the area of the wire the SMALLER the resistance, if area is doubled the resistance is half
3.Temperature= as the temp increases the resistance increases
4.Material= some materials allow electrons to move more freely than others which makes the resistance smaller

Question 20

What happens to the resistance when you cools a substance down

Answer 20

The resistance gets smaller too

Question 21

What happens the the resistance when you heat a substance up

Answer 21

The resistance also increases

Question 22

When the resistance in a circut decreases the current…

Answer 22

Increases

Question 23

In a parallel circuit the voltage of the source is 1.5 V what is the voltage across each lightbulb

Answer 23

1.5V it stays the same

Question 24

In a parallel circuit each lightbulb has a current of 2 A what is the current of the battery

Answer 24

6A

Question 25

In a parallel circut how does the current across the source compare to the current across each lightbulb

Answer 25

The current of the source is the sum of all of the currents in each lightbulb

Question 26

What will happen when a negatively charged rod makes contact with a positively charges sphere

Answer 26

The electrons will move from the rod to the sphere