19 questions
A 3.0 Ω resistor and a 6.0 Ω resistor are connected in parallel.What is their combined resistance?
0.50Ω
2.0Ω
4.5Ω
9.0Ω
The circuit diagram shows a 4.0 Ω resistor and an 8.0 Ω resistor connected to a 6.0V battery. What is the current in the battery?
0.50A
0.75A
1.50A
2.00A
The circuit diagram shows a 4.0 Ω resistor and an 8.0 Ω resistor connected to a 6.0V battery.What is the current in the 8.0 Ωresistor?
0 A
0.50A
0.75A
1.0A
The diagram shows a circuit with a 3.0 Ω resistor and a 2.0 Ω resistor connected in parallel. The switch is open, and the ammeter reads 2.0A. The switch is now closed and the ammeter reads the total current in both resistors. What is the ammeter reading with the switch closed?
1.2 A
3.0 A
4.0 A
5.0 A
A 30 Ω resistor is connected in series with another resistor and a 6.0 V battery. The current in the circuit is 0.12 A. A voltmeter is connected across the other resistor. What is the reading on the voltmeter?
2.4 V
3.6 V
6.0 V
9.6 V
A circuit contains four ammeters A, B, C and D, and three resistors with different values. Which ammeter shows the largest reading?
A
B
C
D
Which one of the following resistors connected in parallel with a 24 Ω would give a total resistance of 8 Ω
16 Ω
12 Ω
8 Ω
6 Ω
40 lamps, each of resistance 8 are connected in series with a 240 V supply, in order to decorate a tree. The current in each lamp is
2.0 A
0.75 A
1.0 A
1.33 A
How are the resistors connected?
In parallel
In series
Top and bottom are in parallel, right is in series
A 3 Ω resistor is connected in series to a 6 Ω resistor and a 12-V battery. What is the current in each of the resistors?
3 Ω → 0.67 A; 6 Ω → 0.67 A
3 Ω → 1.33 A; 6 Ω → 1.33 A
3 Ω → 0.88 A; 6 Ω → 0.44 A
3 Ω → 6 A; 6 Ω → 6 A
Four unequal resistors are connected in series with each other. Which one of the following statements is correct about this combination?
The equivalent resistance is equal to that of any one of the resistors.
The equivalent resistance is equal to average of the four resistances.
The equivalent resistance is less than that of the smallest resistor.
The equivalent resistance is less than that of the largest resistor.
The equivalent resistance is more than the largest resistance.
Four unequal resistors are connected in a parallel with each other. Which one of the following statements is correct about this combination?
The equivalent resistance is less than that of the smallest resistor.
The equivalent resistance is equal to the average of the four resistances.
The equivalent resistance is midway between the largest and smallest resistance.
The equivalent resistance is more than the largest resistance.
None of the other choices is correct.
Draw a circuit with a battery connected to four resistors, R1, R2, R3, and R4, as follows. Resistors R1 and R2 are connected in parallel with each other, resistors R3 and R4 are connected in parallel with each other, and both parallel sets of resistors are connected in series with each other across the battery.
When unequal resistors are connected in series across an ideal battery,
the same power is dissipated in each one.
the potential difference across each is the same.
the current flowing in each is the same.
the equivalent resistance of the circuit is less than that of the smallest resistor.
the equivalent resistance of the circuit is equal to the average of all the resistances.
The circuit shown contains three ammeters X, Y and Z.
Which ammeter has the largest reading?
X
Y
Z
They all have the same reading.
The diagram shows two resistors connected in a circuit.
What could be the combined resistance of this arrangement of resistors?
4.0Ω
6.0Ω
9.0Ω
18Ω