Static And Charge

Question 1

What is current, and how do you measure it

Answer 1

Current is the rate at which electrons flow in an electrical circuit, and it’s measured in amperes (A) or “amps”.

Question 2

Describe how to measure charge,

Answer 2

The current flowing through a component in a circuit is measured using an ammeter. The ammeter can be placed anywhere in the circuit.

Question 3

What is current measured in

Answer 3

Coulombs

Question 4

How to calculate charge flow

Answer 4

Charge flow (coulombs / c) = current (Amps / a ) x time (second / s)

Question 5

What is conventional current

Answer 5

The direction current flows, in the direction of the positive terminal of the battery to the negative terminal.

Question 6

Small currents are measured in

Answer 6

Milliamperes (mA)

1 mA = 1*10^-3 A

Question 7

Equation of current

Answer 7

Current = charge / time

Question 8

Current definition

Answer 8

The rate of flow of charged particles , or charge.

Question 9

How to make static electricity

Answer 9

Rub two insulators together
One will loose electrons and one will gain

Question 10

Can protons be transferred

Answer 10

No

Only electrons

Question 11

What direction do electric fields go from

Answer 11

Positive to negative

Question 12

What is potential difference

Answer 12

The force thag pushes the current around a circuit

Question 13

What is resistance

Answer 13

A measure kf how easily charge can flow

Question 14

Equation for charge

Answer 14

Current x time

Question 15

Equation for voltage

Answer 15

Voltage = current x resistance

Question 16

How to find energy transferred from charge

Answer 16

Charge x potential difference

Question 17

Potential difference in series circuits

Answer 17

Potential difference is shared

Add all PDs to get total PD

Question 18

Current in series circuits

Answer 18

Same current in all parts of the circuit

Question 19

Resistance in series circuits

Answer 19

Same as potential difference, where each component has an induvidual resistance

Question 20

Why would a series circuit break if one component broke

Answer 20

Current wouldn’t flow through the rest of the circuit

Question 21

Potential difference in a parallel circuit

Answer 21

All branches get full source of PD

Question 22

Current in parallel circuit

Answer 22

Current is shared

Question 23

Resistance in parallel circuits

Answer 23

The total resistance will be lower than the resistance in the branches

Question 24

An acetate rod is rubbed with a cloth

A positive static charge builds up on the rod

Explain how the static charge built up

Answer 24

Electrons were transferred from the rod to the cloth

Acetate is an isnulator whjch means that static built up

Question 25

In which type of material does static charge build up

Answer 25

Insulators

Question 26

Why does a metal rod not have a charge even when rubbed with a rod

Answer 26

Metal is a conductor When it is rubbed with a cloth electrons will just flow through it, so it stays neutral

Question 27

When you hold a positively static rod near paper scraps the paper almost jumps Why?

Answer 27

When the positively charged rod is held near the paper scraps, electrons are attracted towards the surface of the paper This means a charge is induced in the paper This gives the surface a negative charge Opposites attract, meaning the negative paper jumps towards the positive rod

Question 28

Whjch directions do electric field lines go from

Answer 28

They go from positive to negative

Question 29

What happens if the charges are free to move (this basically means if the objects that release the charge can move around)

Answer 29

The field lines straighten and shorten as the charges move together