Electric Circuits

Question 1

31. Equation for a Current

Answer 1

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

Question 2

UNITS FOR EQUATION? CURRENT

Answer 2

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

Question 3

WHICH WAY DOES THE CURRENT FLOW?

Answer 3

It flows from the negative terminal to the positive terminal.

Question 4

WHAT IS ELECTRICITY?

Answer 4

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

Question 5

WHAT IS THE ELECTRON CHARGE ?

Answer 5

1.6 X 10^-19 (C) Coulombs

Question 6

32. WHAT IS THE EQUATION FOR VOLTAGE?

Answer 6

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

Question 7

UNITS OF EQUATION VOLTAGE

Answer 7

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

Question 8

33. OHMS LAW EQUATION FOR PD

Answer 8

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

Question 9

34. WHAT IS CHARGE CONSERVATION?

Answer 9

principle that total electric charge in a isolated system never changes

Question 10

35.

Answer 10

35.

Question 11

36.

Answer 11

36.

Question 12

39. FORMULA FOR RESISTIVITY FOR A WIRE?

Answer 12

RESISTANCE =

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

Question 13

41. FORMULA FOR THE LARGE RANGE OF RESISTIVITY?

Answer 13

I=NAVE N= I/AVE

Question 14

UNITS FOR LARGE RANGE OF RESISITIVITY

Answer 14

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

Question 15

RESISTANCE CALCULATIONS FORMULA PARALLEL

Answer 15

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

Question 16

What is Potential Difference

Answer 16

PD IS V =IR

Question 17

Formula to find Charge

Answer 17

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

Question 18

Equation for power

Answer 18

Power = Voltage x Current.           
Power = Work Done x Time

Question 19

Equation for work done

Answer 19

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

- Resistance

Question 20

What is Ohms Law ?

Answer 20

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

Question 21

Describe the distribution of current in a series circuit

Answer 21

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

Question 22

What law does distribution of current in a series obey?

Answer 22

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.

Question 23

Describe the distribution of current in a parallel circuit.

Answer 23

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.

Question 24

Potential Difference in series and parallel.

Answer 24

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

Question 25

What is the IV of ohmic conductor?

Answer 25

``` I. | | /. Y=x | / | / | / V | _/_____________________ ```

Question 26

What is the IV characteristics for filament bulb?

Answer 26

Graph_ | _ /

Question 27

What is the IV characteristics for a diode?

Answer 27

Graph / / _______/

Question 28

Energy Efficiency formula

Answer 28

Useful / total X 100

Question 29

Upward force on something

Answer 29

Normal contact force

Question 30

Newton’s first law

Answer 30

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

Question 31

Newton’s second law

Answer 31

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

Question 32

Newton’s third law

Answer 32

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

Question 33

Moment

Answer 33

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

Question 34

Kg to N mass to force

Answer 34

1 kg is equal to 9.81 N

Question 35

Momentum P

Answer 35

Momentum (P) = Mass X Velocity

Question 36

Electromotive force

Answer 36

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