Test sull’Elettricità e il Magnetismo
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Domanda 1 di 5
What is the SI unit of electric charge?
A. ampere
B. coulomb
C. volt
D. ohm
Spiegazione
The coulomb (C) is the SI unit of electric charge; ampere is unit of current, volt of potential, ohm of resistance.
Domanda 2 di 5
Which law states that a changing magnetic field induces an electromotive force?
A. Faraday's law
B. Ohm's law
C. Coulomb's law
D. Newton's law
Spiegazione
Faraday's law of electromagnetic induction describes how a time-varying magnetic flux induces an EMF in a circuit.
Domanda 3 di 5
Which of the following is the SI unit of electrical resistance?
A. volt
B. coulomb
C. ohm
D. tesla
Spiegazione
The ohm (Ω) is the SI unit of electrical resistance; volt measures potential difference, tesla measures magnetic flux density.
Domanda 4 di 5
In a series circuit, how does the electric current behave through each component?
A. voltage is the same across each component
B. current is the same through all components
C. resistance is the same for all components
D. power is equal for all components
Spiegazione
In a series circuit the same current flows through every component because there is a single path for charge flow.
Domanda 5 di 5
Which device converts mechanical energy into electrical energy using magnetic induction?
A. generator
B. transformer
C. battery
D. electric motor
Spiegazione
A generator converts mechanical to electrical energy by rotating coils in a magnetic field; a motor does the opposite.
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