Electric Potential quiz #2 Flashcards
Electric Potential quiz #2
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How is the voltage of a battery in a circuit defined?
The voltage of a battery in a circuit is the potential difference between its terminals, also known as its emf. How do you express the reading of a voltmeter in terms of the emf (E) of a battery?
The voltmeter reading is equal to the emf (E) if no current flows, or less than E if there is internal resistance and current flows. How do you express the reading of a voltmeter in terms of the emf (E) of a battery?
The voltmeter reading is equal to the emf (E) if no current flows, or less than E if there is internal resistance and current flows. How do you express the reading of a voltmeter in terms of the emf (E) of a battery?
The voltmeter reading is equal to the emf (E) if no current flows, or less than E if there is internal resistance and current flows. How is voltage defined in terms of energy and charge?
Voltage is defined as the electric potential energy per unit charge, V = U/Q. What does a voltmeter test in a circuit?
A voltmeter tests the potential difference (voltage) between two points in a circuit. A volt is a unit of which physical quantity?
A volt is a unit of electric potential or electric potential difference. Between two points, a and b, which has a larger electric potential if a positive charge moves from a to b and gains energy?
Point b has a larger electric potential if a positive charge moves from a to b and gains energy. How do you calculate the voltage across a resistor in a circuit?
The voltage across a resistor is the potential difference between its two ends, calculated as ΔV = V_end - V_start. For a point charge, how does the electric potential vary with distance from the charge?
For a point charge, the electric potential varies inversely with distance: V = kQ/r. How do you determine the potential difference across a resistor in a circuit?
The potential difference across a resistor is the voltage drop, equal to the difference in electric potential between its two ends. How do you calculate the electric potential at a point indicated by a dot near a point charge?
The electric potential at the point is V = kQ/r, where r is the distance from the charge to the dot. What is the electric potential difference between the ground and a cloud during a thunderstorm?
The electric potential difference between the ground and a cloud during a thunderstorm is the voltage that drives lightning, often several million volts. How do you find the potential difference between point a and point c?
The potential difference between point a and point c is ΔV = Va - Vc. How do you calculate the electric potential at point a due to a point charge?
The electric potential at point a due to a point charge is V = kQ/r, where r is the distance from the charge to point a.
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