Physics Ka1

Question 1

What is the equation for charge?

Answer 1

Charge = current(A) x time(s)

Question 2

The higher the _____ of the supply, the greater the amount of _____ transferred for a given amount of charge which flows. Double the _____ will double the charge flow in one second.

Answer 2

Voltage, energy, current

Question 3

What is a current?

Answer 3

A flow of charged particles

Question 4

What are the charged particles in a metal?

Answer 4

Free electrons

Question 5

How does the current flow in a circuit?

Answer 5

From the positive side to the negative side

Question 6

In a parallel circuit, if the current of A1 is 0.28, then what are the charges of A2 and A3?

Answer 6

0.14 and 0.14

Question 7

What is charge measured in?

Answer 7

Coulombs (C)

Question 8

What is the symbol for current?

Answer 8

I

Question 9

What is the symbol for charge?

Answer 9

Q

Question 10

A circuit with a current of 0.1A is left on for 10 mins, how much charge flows?

Answer 10

Q= I x T

= 0.1 x 600

= 60C

Question 11

How long will it take a current of 0.5A to move 100C of charge?

Answer 11

T = Q/I

= 100C / 0.5A

= 200 seconds

Question 12

If 1500C of charge moves in 1000s, what is the current?

Answer 12

I = Q / T

= 1500C / 1000

= 1.5A

Question 13

What is the electron charge?

Answer 13

1.6 x 10^19 C

Question 14

The bigger the p.d across a component, the bigger the _____ that flows through it

Answer 14

Current

Question 15

The current flowing through a component In a circuit is measured in ______ using an ammeter connected in a series component

Answer 15

Amperes (a)

Question 16

When components are connected in a series the ____ current flows through each component

Answer 16

Same

Question 17

When components are connected in a parallel THE the total current is the ____ of the currents in each loop

Answer 17

Sum

Question 18

What happens to the current when the resistance is increased?

Answer 18

It decreases

Question 19

What happens to the current when there is a larger p.d?

Answer 19

It increases

Question 20

What causes resistance?

Answer 20

Collisions between the moving electrons and the vibrating ions in the wire. More collisions means the current flow is reduced

Question 21

What is the equation for p.d?

Answer 21

P.d = resistance x current

Question 22

What is the symbol for resistance?

Answer 22

R

Question 23

What is the symbol for p.d?

Answer 23

V

Question 24

What is the symbol for current?

Answer 24

I (A)

Question 25

What are the units of resistance?

Answer 25

Ohms

Question 26

What happens to the current in a series circuit?

Answer 26

The same current passes through components in series with each other

Question 27

When ______ are connected in a series their total resistance is the sum of their separate _______

Answer 27

Components, resistances

Question 28

What is the sum for finding out the total resistance in a series?

Answer 28

R= R1 + R2 + R3

Question 29

The current through a resistor (at constant temperature) is _______ to the voltage across the resistor

Answer 29

Proportional

Question 30

The unit for current is _____

Answer 30

Ampere

Question 31

Resistance is measured in _____

Answer 31

Ohms

Question 32

P.d = _______ x ________

Answer 32

P.d = resistance (ohms) x current (ampere)

Question 33

What happens to the lamps brightness when the variable resistance is reduced?

Answer 33

The lamps brightness gets brighter because the current increases

Question 34

What is voltage proportional to?

Answer 34

Current I V x I V= R x I R = V/I

Question 35

How does the resistance of a wire depend on the resistance of its length?

Answer 35

The resistance of wire is directly proportional to its length. When the length is 2x, the resistance doubles

Question 36

What happens when we increase the resistance in a series circuit?

Answer 36

Increasing resistance reduces current and lamp brightness

Question 37

What is lightening?

Answer 37

An electric current. This is because of a sudden electrostatic discharge