WorksheetsLO Fri 19 Jan
Total questions: 17
Worksheet time: 9mins
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
the total charge, Q flowing through the area per unit time, t.
the total current, I flowing through the area per unit time, t.
the rate of capacitance flow through a conductor.
the rate of current flow through a conductor
What type of quantity does the current belongs to?
a base and vector quantities
a base and scalar quantities
a derived and vector quantities
a derived and scalar quantities
1 ampere of current is defined as ......
one coulomb of current passing through the surface area in one second.
one coulomb of charge passing through the conductor in one second
one coulomb of charge passing through the surface area in one second
one coulomb of currrent passing through the conductor in one second.
Electrons move towards the point of ________________ potential.
higher
lower
State Ohm's Law.
the potential difference across a metallic conductor is proportional to the resistance flowing through it if its temperature is constant.
the resistance across a metallic conductor is proportional to the current flowing through it if its temperature is constant.
the potential difference across a metallic conductor is proportional to the current flowing through it if its temperature is constant.
the current across a metallic conductor is proportional to the potential difference flowing through it if its temperature is constant.
Which equation defines Ohm's Law?
V=IV
R=VI
I=VR
V=IR
Resistivity is defined as .....
the capacitance of a unit length per unit cross-sectional area of the material
the resistance of a unit length per unit cross-sectional area of the material
the capacitance of a unit cross-sectional area per unit length of the material
the resistance of a unit cross-sectional area per unit length of the material
From the equation, we know that the resistance of a conductor depends on..?
length of conductor
cross sectional area
type of material
volume of the wire
Unit for resistivity is
Ohm
Ohm meter
Ohm per meter
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.
------ is known as the ratio of the change of resistivity in a material due to a change of temperature of 1ᵒC to its resistivity at 20ᵒC.
capacitance
temperature coefficient of resistance
temperature coefficient of resistivity
resistance
Unit for temperature coefficient of resistivity is
Kelvin
Ohm meter
Ohm per meter
Per Kelvin
emf is defined as.....
potential difference between battery
energy provided by the source to each unit of charge that flows thorugh external and internal resistances
energy provided by the source to each unit of charge that flows thorugh external resistance only
total voltage in the circuit
internal resistance is..
the resistance of the chemicals inside the battery between the poles
the resistance of the chemicals inside the circuit between the poles
total resistance in the circuit
the resistance provide by the resistor
Which of the following is NOT TRUE about internal resistance?
The longer you use the battery the bigger the internal resistance
Internal resistance depends on electrodes
Internal resistance depends on temperature of electrolyte
Internal resistance depends on the total external resistance in the circuit
