PHYS102- CHAPTER 27 EXAM QUESTIONS WITH VERIFIED SOLUTIONS LATEST UPDATE 2024 ALREADY PASSED.
Space heaters convert most of the electrical energy in a circuit into ____. - Answers thermal energy
An aluminum wire has a resistivity of 17 Ω ·cmils/ft and a cross-sectional diameter of 0.2 in. What ...
Space heaters convert most of the electrical energy in a circuit into ____. - Answers thermal energy
An aluminum wire has a resistivity of 17 Ω ·cmils/ft and a cross-sectional diameter of 0.2 in. What length
of this wire is needed to construct a 1700- Ω resistor? - Answers 4 × 10 6 ft
A device that measures the amount of current in a circuit is a(n) ____. - Answers ammeter
The current flowing in an electric circuit can be increased by ____. - Answers increasing voltage or
decreasing resistance
An emf of 12 V will move 6.25 × 1018 electrons past a given point in 2 s. The resistance is ____. -
Answers 24 Ω
A wire is attached to a 1.5 V battery. How much work is done on an electron in the wire? - Answers 2.40
× 10-19 J
The potential difference between the terminals of a small heater is 60 V. If the resistance of the heater is
30 Ω, the current is ____. - Answers 2 A
A battery is attached to a capacitor. A transient current will exist in the circuit for a very short time. -
Answers True
Electric resistance increases with an increase in the cross-sectional area of a conductor. - Answers False
According to Ohm's law, the electric current is inversely proportional to the applied voltage. - Answers
False
The resistivity of a wire is independent of the length of the wire. - Answers True
A wire with a diameter of 0.002 in. has a cross-sectional area of 4 cmils. - Answers true
The power loss in a wire is quadrupled if the current is doubled. - Answers True
In a copper wire, motion of the protons gives rise to the conventional current. - Answers False
The term I2R gives the total amount of energy converted to heat. - Answers False
The temperature coefficient of resistance is equal to the change in resistance per degree change in
temperature. - Answers False
The unit for temperature coefficient of resistance can be 1/Co or 1/K. - Answers True
To measure the potential of a battery, a voltmeter is connected in parallel to the battery. - Answers True
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