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Physics > Electric Circuits > Flashcards

Electric Circuits Flashcards

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1
Q
  1. Equation for a Current
A

Current(I) = change in Charge (Q)/ change in Time(T)

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2
Q

UNITS FOR EQUATION? CURRENT

A

Current (I) (Amp)
Charge (Q) (Coulombs)
Time (T) (sec)

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3
Q

WHICH WAY DOES THE CURRENT FLOW?

A

It flows from the negative terminal to the positive terminal.

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4
Q

WHAT IS ELECTRICITY?

A

It is the flow of electrons in the wire that constitute the current

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5
Q

WHAT IS THE ELECTRON CHARGE ?

A

1.6 X 10^-19 (C) Coulombs

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6
Q
  1. WHAT IS THE EQUATION FOR VOLTAGE?
A

Voltage (V)=Work Done (W)/ Charge (q)

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7
Q

UNITS OF EQUATION VOLTAGE

A

Voltage (V) (Volts)
Work Done (W) (Joules)
Charge (Q) (Coulomb)

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8
Q
  1. OHMS LAW EQUATION FOR PD
A

V (cell) = I (in the wire) R (resistor)

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9
Q
  1. WHAT IS CHARGE CONSERVATION?
A

principle that total electric charge in a isolated system never changes

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10
Q

35.

A

35.

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11
Q

36.

A

36.

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12
Q
  1. FORMULA FOR RESISTIVITY FOR A WIRE?
A

RESISTANCE =

P(resistivity) X LENGTH (L) / CS AREA

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13
Q
  1. FORMULA FOR THE LARGE RANGE OF RESISTIVITY?
A

I=NAVE N= I/AVE

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14
Q

UNITS FOR LARGE RANGE OF RESISITIVITY

A 
I=CURRENT=AMPS
N=ELECTRON DENSITY
A=CS AREA
V= VELOCITY 
E=CHARGE 1.6 X 10^-19 C
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15
Q

RESISTANCE CALCULATIONS FORMULA PARALLEL

A

FOR EACH ARE 1/R = 1/R1 + 1/R2 (1/R RECIPRICOL)

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16
Q

What is Potential Difference

A

PD IS V =IR

17
Q

Formula to find Charge

A

(Q)charge = NE (no if e)(charge) = IT

18
Q

Equation for power

A 
Power = Voltage x Current.           
Power = Work Done x Time
19
Q

Equation for work done

A

W (work done) = VI (Power) x T

- Resistance

20
Q

What is Ohms Law ?

A

If Ohms Law is obeyed, the current and voltage passing through a component are directly proportional, when at a constant temperature

21
Q

Describe the distribution of current in a series circuit

A

In a series circuit, the current stays the same at all positions in the circuit

22
Q

What law does distribution of current in a series obey?

A

The Law of Conservation of Charge. Charge cannot be created or destroyed and so is in a closed loop
:. The flow of the charge should be the same throughout.

23
Q

Describe the distribution of current in a parallel circuit.

A

In a parallel the current is split between the different branches. The current entering in each branch should be the same as the current leaving the branch.

24
Q

Potential Difference in series and parallel.

A

The P.d. In a series is split, in parallel it is the same around all the components.

25
Q

What is the IV of ohmic conductor?

A 
I.  |
    |                 /.     Y=x
    |              /
    |          /  
    |       /                               V
    | _/\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_
26
Q

What is the IV characteristics for filament bulb?

A

Graph_

_ /

27
Q

What is the IV characteristics for a diode?

A

Graph /
/
_______/

28
Q

Energy Efficiency formula

A

Useful / total X 100

29
Q

Upward force on something

A

Normal contact force

30
Q

Newton’s first law

A

A body will remain at rest or constant velocity unless it is acted upon by a net external resultant force.

31
Q

Newton’s second law

A

Acceleration of a body with constant mass is related to the net external force acted on the body
F=MA
RESULTANT FORCE = MASS X ACC

32
Q

Newton’s third law

A

When a body exerts a force on another body second body exerts a force back on the first body with the same magnitude same type in a straight line opposite direction as the force exerted by the first body

33
Q

Moment

A

Moment = force x distance (from the from the pivot perpendicular to forces line of action)

34
Q

Kg to N mass to force

A

1 kg is equal to 9.81 N

35
Q

Momentum P

A

Momentum (P) = Mass X Velocity

36
Q

Electromotive force

A

Electromotive force is work done per unit charge to move a charge around a circuit

Physics (13 decks)

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