Physics 2 Test 3
As more resistors are added in parallel to a constant voltage source, the power supplied by the source
increases
The resistivity of most common metals
increases as temperature increases
Three identical resistors are connected in series to a battery. If the current of 12 A flows from the battery, how much current flows through any one of the resistors?
12A
Three identical resistors are connected in parallel to a 12-V battery. What is the voltage of any one of the resistors?
12V
Three identical resistors are connected in parallel to a battery. If the current of 12 A flows from the battery, how much current flows through any one of the resistors?
4A
Three identical resistors are connected in series to a 12-V battery. What is the voltage across any one of the resistors?
4V
A battery create net electric charge
False
A battery is responsible for supplying a constant current to a circuit
False
A series circuit is a current divider and a parallel circuit is a voltage divider circuit.
False
An RC circuit is connected across a DC voltage source through an open circuit and a switch. As soon as the switch is closed, the charge on the capacitor increases but the voltage across it decreases as a function of time
False
An RC circuit is connected across a DC voltage source through an open switch. As soon as the switch is closed, the capacitor charges linearly as a function of time.
False
Current in a metal wire is inversely proportional to the potential difference applied to its two ends
False
If a fuse repeatedly blows, it should be replaced by a fuse of one step higher rating
False
The fatter a given length of wire, the higher its resistance
False
The resistance of most metals generally decreases with temperature
False
The resistivity of the material of a wire is inversely proportional to the resistance of the wire
False
Part complete Outlets on a household circuit are arranged in
Parallel
The lamps in a string of Christmas tree lights are connected in parallel. What happens if one lamp burns out? (Assume negligible resistance in the wires leading to the lamps.)
The brightness of the lamps will not change appreciably.
Consider two copper wires of the same length. One has twice the cross-sectional area of the other. How do the resistances of these two wires compare?
The thicker wire has half the resistance of the shorter wire
Which one of the following is a correct statement for a number of resistors connected in series or parallel? The total resistance in a series circuit decreases as more resistors are added. The voltage is different across resistors connected in a parallel circuit. The flow of current is different through resistors connected in a series circuit. The total resistance in a parallel circuit decreases as more resistors are added. None of the above statements is correct.
The total resistance in a parallel circuit decreases as more resistors are added.
Four unequal resistors are connected in a series circuit. Which one of the following statements is correct about this circuit? The total resistance is less than the smallest resistor. The total resistance is equal to average of the four resistors. The total resistance is equal to any one of the resistors. The total resistance is less than the largest resistor. The total resistance is more than the largest resistor.
The total resistance is more than the largest resistor.
A 1200-W toaster draws more current than a 1000-W toaster
True
A lightbulb cannot absorb charge.
True
As a dry cell ages, its internal resistance goes up.
True
Conventional current is the flow of positive charge from higher to lower potential
True
Four equal resistors connected in series have same current and same voltage across each resistor
True
Four unequal resistors connected in series have same current but different voltages.
True
Kirchhoff's voltage rule is an example of conservation of energy.
True
The current in a circuit flows in the opposite direction to which the electrons move
True
The electromotive force of a battery is the maximum potential difference between the terminals of the battery
True
The longer a given diameter of wire, the higher its resistance
True
When two or more resistors are connected in parallel to a battery, the equivalent resistance of the combination is less than the resistance of any one of the resistors. the total current flowing from the battery equals the sum of the currents flowing through each resistor. the voltage across each resistor is the same. all of the given answers none of the given answers
all of the given answers
When two or more resistors are connected in series to a battery the same current flows through each resistor. the equivalent resistance of the combination is equal to the sum of the resistances of each resistor. the total voltage across the combination is the algebraic sum of the voltages across the individual resistors. all of the given answers none of the given answers
all of the given answers
As more resistors are added in series to a constant voltage source, the power supplied by the source
decreases.
The potential difference between the terminals of a battery, when no current flows to an external circuit, is referred to as the
emf
Current flows through a resistor
from high potential to low potential
An advantage of a circuit breaker over a fuse is
it is easier to re-enable the circuit.
The potential difference between the terminals of a battery, when current flows to an external circuit, is referred to as the
terminal voltage
When resistors are connected in series,
the current flowing in each is the same.
Kirchhoff's junction rule is a statement of
the law of conservation of charge.
Kirchhoff's loop rule is a statement of
the law of conservation of energy.
When resistors are connected in parallel, we can be certain that
the potential difference across each is the same.
