Chapter 17 - Current Electricity

Question 1

Definition electric current, I,

Answer 1

Rate of flow of electric charge

Question 2

S.I Unit for current

Answer 2

Ampere (A)

Question 3

What is the instrument used to measure current?

Answer 3

Ammeter

Question 4

Common Circuit Symbols, in notes

Answer 4

okay

Question 5

What is conventional current?

Answer 5

a flow of the positive charges from the positive terminal of the battery to the negative

Question 6

When will electric current flow?

Answer 6

Whenever there is a potential difference

Question 7

Current = ? (Time and Charge)

Answer 7

Charge/Time

Question 8

What is the Symbol for Charge

Answer 8

Q

Question 9

Definition of Potential Difference

Answer 9

The work done to drive a unit charge through the two points

Question 10

What is Symbol Potential Difference

Answer 10

V

Question 11

Potential Difference = ? (Work done and Charge)

Answer 11

Work Done (or Energy) / Charge

Question 12

S,I Unit Potential Difference

Answer 12

V

Question 13

Definition is Electromotive Force

Answer 13

Work don by the cell in driving a unit charge around a complete circuit

Question 14

Symbol for Electromotive Force

Answer 14

inverted 3

Question 15

Electromotive Force=?

Answer 15

Work Done/Charge

Question 16

What is the advantage and disadvantage of the cells in series?

Answer 16

The voltage of each batteries will total up and thus the bulb will be brighter

Cells/batteries will last shorter time

Question 17

What is the advantage and disadvantage of the cells in parallel?

Answer 17

Cell/Batteries will last longer time

The voltage of each batteries will not total up and only give the voltage of one battery thus the bulb will be less bright just like using the one single cell

Question 18

Definition of Resistance

Answer 18

the ratio of the potential difference V across it to the current and flowing through it.

Question 19

Symbol for Resistance

Answer 19

R

Question 20

S.I.Unit for Resistance

Answer 20

ohms (Ω)

Question 21

Resistance=?

Answer 21

Voltage/Current

Question 22

Ohm’s Law state that?

Answer 22

The current passing through a metallic conduction is directly proportional to the potential difference across it, provided that physical conditions (such as temperature) remain constant

Question 23

A substance that obey Ohm’s Law is called?

Answer 23

Ohmic Conductor

Question 24

A substance that obey Ohm’s Law is called?

Answer 24

non-ohmic conductor

Question 25

How is a a graph of V against I for an ohmic conductor looks like?

Answer 25

Linear graph L/

Question 26

Graph for non-ohmic conductor are curves, pls refers to notes

Answer 26

okay

Question 27

Symbol for Resistivity

Answer 27

(ρ)

Question 28

What are the physical properties that will affect resistance?

Answer 28

Temperature
Length
Area
Type of material/Resistivity

Question 29

When the length of wire increase, its resistance?

Answer 29

Increases

Question 30

When the Thickness or area of the cross-section of the wire increase, the resistance ?

Answer 30

Decrease

Question 31

S.I Unit for resistivity

Answer 31

(Ωm)

Question 32

Resistance = ? (Resistivity, Length, Area)

Answer 32

(ρ) x Length / Area

Question 33

Good Conductor also have _____ Resistance

Answer 33

Low

Question 34

Variable resistor is also known as?

Answer 34

rheostat

Question 35

Variable resistor can adjust resistance of the wire base on which physical property?

Answer 35

Length

Question 36

Refer to notes for the experiment to determine the resistance of a unknown resistor

Answer 36

okay