current and circuits revise

what is electric current ?

• the rate pf amplitude .

• the rate of flow of positive on negative charges.

• the rate of flow negative charge on positive charge.

How to find current ?

• I=Q/T

• I=T/S

• I=C/S

• I=M/N

How to find ampere ?

• A=C/S

• A=S/C

• A=1/C

• A=T/S

Other way to find current ?

• I = ne/t

• I = c/s

• I = m/s

How much does the elementary charge (e) equals?

• 1.6x10^-19 C

• 1.6x10^-21 C

• 16x1.0^-19 C

What is the conventional current ?

• The flow of positive charges

  (+) --> (-)

• The flow of negative charges

  (-) --> (+)

where does the charges flow?

• In electric circuits

• In electric

  field

• In conventional current

• In electric current

Ohm's law states that :

• The potential difference is directly proportional to the electric current ( I )

• The potential difference is un-proportional to the electric current ( I )

How to decrease current in the circuit ?

• decrease voltage - increase resistance

• increase voltage - increase resistance

• increase voltage - decrease resistance

• decrease voltage - decrease resistance

what are the factors that affects on the resistance ?

• length of wire , cross-sectional area , temperature , material - resistivity

• magnitude , slope , ampere , conductor