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Physics > Physics Ka1 > Flashcards

Physics Ka1 Flashcards

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1
Q

What is the equation for charge?

A

Charge = current(A) x time(s)

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2
Q

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.

A

Voltage, energy, current

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3
Q

What is a current?

A

A flow of charged particles

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4
Q

What are the charged particles in a metal?

A

Free electrons

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5
Q

How does the current flow in a circuit?

A

From the positive side to the negative side

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6
Q

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

A

0.14 and 0.14

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7
Q

What is charge measured in?

A

Coulombs (C)

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8
Q

What is the symbol for current?

A

I

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9
Q

What is the symbol for charge?

A

Q

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10
Q

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

A

Q= I x T

= 0.1 x 600

= 60C

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11
Q

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

A

T = Q/I

= 100C / 0.5A

= 200 seconds

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12
Q

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

A

I = Q / T

= 1500C / 1000

= 1.5A

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13
Q

What is the electron charge?

A

1.6 x 10^19 C

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14
Q

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

A

Current

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15
Q

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

A

Amperes (a)

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16
Q

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

A

Same

17
Q

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

A

Sum

18
Q

What happens to the current when the resistance is increased?

A

It decreases

19
Q

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

A

It increases

20
Q

What causes resistance?

A

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

21
Q

What is the equation for p.d?

A

P.d = resistance x current

22
Q

What is the symbol for resistance?

A

R

23
Q

What is the symbol for p.d?

A

V

24
Q

What is the symbol for current?

A

I (A)

25
Q

What are the units of resistance?

A

Ohms

26
Q

What happens to the current in a series circuit?

A

The same current passes through components in series with each other

27
Q

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

A

Components, resistances

28
Q

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

A

R= R1 + R2 + R3

29
Q

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

A

Proportional

30
Q

The unit for current is _____

A

Ampere

31
Q

Resistance is measured in _____

A

Ohms

32
Q

P.d = _______ x ________

A

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

33
Q

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

A

The lamps brightness gets brighter because the current increases

34
Q

What is voltage proportional to?

A

Current I

V x I

V= R x I

R = V/I

35
Q

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

A

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

36
Q

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

A

Increasing resistance reduces current and lamp brightness

37
Q

What is lightening?

A

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

Physics (5 decks)

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