43 Questions
What is the unit for charge?
Coulombs
What is the rate of flow of charge carriers defined as?
Rate of ions
What makes metals good conductors of electricity?
Presence of free electrons
What type of atoms are ions?
Atoms that have lost or gained an electron
In which material do conduction electrons create a current flow?
Metals
What is the definition of electric current?
The movement of positive charge carriers
How is electric current measured?
In units of amperes
Which symbol represents current in physics?
I
What happens when two oppositely charged conductors are connected by a wire?
Charge will flow between the conductors causing a current
How are charge, current, and time related?
$ ext{current} = rac{charge}{time}$
What is the unit of charge defined as the quantity of charge that passes a fixed point per second when a current of 1A is flowing?
Coulomb
What is the drift velocity of charge carriers?
Slow
In which direction does conventional current flow in a metal?
From positive to negative
In which direction is the drift velocity of positive charge carriers?
Same as the current
Which particle has a negative charge?
Electron
What is the elementary charge value in Coulombs?
$1.60 \times 10^{-19}$ C
What does a high number density of charge carriers in a conductor indicate?
Slower drift velocity
How does the cross-sectional area of a wire affect the drift velocity?
Inversely proportional
What property do particles like protons and neutrons possess?
$Q = It$
What charge does the symbol 'q' represent for electrons?
-1.60 x 10^-19 C
What determines how well a material conducts electricity?
Number density of charge carriers
Which material has a conductivity that falls at high temperatures and rises at low temperatures?
Semiconductors
What is the function of a diode in a circuit?
Allow current flow in one direction only
Why are impurities added to semiconductor materials?
To improve their conducting properties by increasing the value of n
Which component provides the circuit with a source of e.m.f?
Cell / battery / D.C supply
What type of ion is defined as a positive ion that has lost an electron?
A cation
Which of the following correctly defines an electrolyte?
A substance that produces an electrically conducting solution with charge carriers as cations and anions
In a series circuit, what can be said about the current at any point?
The current is the same at all points
According to Kirchhoff's First Law, what does the sum of currents entering a junction equal to?
The sum of currents out of the junction
Which statement accurately describes the flow of current in a parallel circuit?
The current divides at the junctions and each branch has a different value
Where should an ammeter be connected in a circuit?
In series with other components
What is the role of a voltmeter in a circuit?
Measure potential difference
Why are the resistances of ammeters and voltmeters considered negligible in exam questions?
To simplify calculations
What is the direction of current flow in a circuit?
From positive to negative terminal
Which component should be drawn with the correct circuit symbol in an electric circuit diagram?
Ammeter
What is essential for electrons to flow in a complete loop in a circuit?
Closed path or complete circuit
In which type of connection should a voltmeter be placed to measure potential difference?
Parallel connection
What does a diode symbolize in a circuit diagram?
One-way current flow
If 1 J of energy is used by 1 C of charge in an electrical circuit, how much current will pass through?
1 A
When a charge of 4 C passes in 500 s in an electrical circuit, what current will be generated?
0.5 A
If a charge of 8 Coulombs passes through an electrical circuit in 100 seconds, what will be the corresponding current?
4 A
In an electrical circuit, if a charge of 1 Coulomb passes in 8 seconds, what will be the current flowing?
0.5 A
What is the relationship between the energy used by a charge in an electrical circuit and the resulting current?
The greater the energy used by charge, the higher the resulting current.
Test your knowledge on conductors, semiconductors, and insulators. Understand the concept of number density of charge carriers and how it impacts the conduction of electricity in different materials.
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