Font size
WorksheetsLecture 3.1-3.5 Electric Current & Direct Current Circuits
Total questions: 11
Worksheet time: 11mins
Microscopic model of current:
In metal, free electrons that move freely and randomly will experience electric force when electric field is applied. They will tend to (a) to the direction of the electric field.
Microscopic model of current :
Electric current is flowing in the opposite direction of the (a) .
Define electric current
(a)
State Ohm's law.
(a)
Define resistivity.
(a)
Which of the following is incorrect about the effect of temperature on electrical resistance in metal?
The electrical resistance in metal always increases with increasing temperature.
When the temperature increases, the number of free electrons per unit volume in metal remains unchanged.
Metal atoms in the crystal lattice vibrate with greater amplitude and cause the number of collisions between the free electrons and metal atoms increase. Hence the resistance in the metal will decreases.
Metal atoms in the crystal lattice vibrate with greater amplitude and cause the number of collisions between the free electrons and metal atoms increase. Hence the resistance in the metal increases.
Define electromotive force.
(a)
Define internal resistance.
(a)
Choose 3 options that is correctly described the factors that influence the internal resistance?
Inversely proportional to surface area of the electrodes in electrolyte
Inversely proportional to temperature of electrolyte
Inversely proportional to distance between the electrodes
Inversely proportional to concentration of electrolyte
V=ϵ−Ir is the equation that shows the relationship between emf of a battery and potential difference across the battery terminals. This is because when the current flow from the battery, (a) .
A : RE=R1+R2+R3 and B : RE1=R11+R21+R31 are two equations that will be apply to calculate the effective capacitance. Which of the following is correctly paired to the arrangement of resistors?
A : Series & B : parallel
A : Parallel & B : Series
