Transcript DC Circuits 2011 Final

Grade 6: Physical Sciences – Electricity
Created by Kshamta Hunter and Marina Milner-Bolotin
Email: [email protected] [email protected]
Questions 1a: Elements of a Circuit
Which element of a circuit is responsible for
turning it on or off?
A.
B.
C.
D.
E.
Bulb
Battery
Switch
Resistor
Wire
Questions 1b: Elements of a Circuit
Which element of a circuit is responsible for
supplying energy to the circuit?
A.
B.
C.
D.
E.
Bulb
Battery
Switch
Resistor
Wire
Questions 1c: Elements of a Circuit
Which element of a circuit is responsible for
connecting different elements of the
circuit (completing it)?
A.
B.
C.
D.
E.
Bulb
Battery
Switch
Resistor
Wire
Questions 1d: Elements of a Circuit
Which of the following elements converts
electrical energy into heat under normal
conditions?
A.
B.
C.
D.
E.
Bulb
Battery
Resistor
Both A and B
Both A and C
Questions 2a: Circuit Diagrams
What does A stand for?
A.
B.
C.
D.
B
A
Battery
Light bulb
Wires
Switch
D
B
C
B
Questions 2b: Circuit Diagrams
What does B stand for?
A.
B.
C.
D.
Battery
Light bulb
Wires
Switch
B
A
C
D
B
B
Questions 2c: Circuits
When the switch is closed, which one of the circuits
will have the light on? (ASSUMING ALL CONNECTIONS ARE
MADE CORRECTLY)
1
2
A. 1 only
B. 1 and 2 only
C. 1, 2 and 3 only
D. All of them
E. None of them will turn the light bulb on
3
4
Questions 2d: Circuit Diagrams
Which of the circuits
below corresponds to
the circuit above?
Battery
A.
B.
C.
D.
Circuit A
Circuit B
Both circuits
None of them
A
Light bulb
B
Wire
Questions 3a: Series and Parallel
Circuits
Which of these circuits is a series circuit
and which one is a parallel circuit?
Battery
A. A – series; B - parallel
B. A- parallel; B - series
Light bulb
C. Both are series
D. Both are parallel
E. Depends on the battery
Wire
A
B
Question 3b: Series Circuits
Two identical light bulbs are connected in a series circuit
as shown in the diagram. How will the bulbs’ brightness
compare to each other?
A
A. Bulb A will be brighter than bulb B
B. Bulb B will be brighter than bulb A
C. The bulbs will be equally bright
D. Bulb A will be lit and bulb B won’t
E. Bulb B will be lit and bulb A won’t
B
Question 3c: Parallel Circuits
Two identical light bulbs are connected in a parallel circuit
as shown in the diagram. How will the bulbs’ brightness
compare to each other?
A. Bulb A will be brighter than bulb B
B. Bulb B will be brighter than bulb A
C. The bulbs will be equally bright
D. Bulb A will be lit and bulb B won’t
E. Bulb B will be lit and bulb A won’t
A
B
Question 3d: Series and Parallel Circuits
Two identical light bulbs are connected first in a series circuit
and then in a parallel circuit as shown in the diagrams. In which
circuit will the bulbs be brighter?
A. The bulbs will be brighter in series
circuit.
B
A
B. The bulbs will be brighter in parallel
circuit.
C. The bulbs will be equally bright in
series and parallel circuits.
A
B
Question 4a: Electron Flow through a Circuit
In the following circuit, 100 electrons flow out of the battery
towards light bulb A. How many electrons will enter light bulb A?
HOW CAN YOU IMPROVE THIS QUESTION? WHY?
A. Exactly 100 Electrons
B. About 90 Electrons
C. About 75 Electrons
D. About 25 Electrons
E. No Electrons
A
B
Question 4b: Electron Flow through a Circuit
In the following circuit electrons flow out of the battery
towards light bulb B. Then they flow towards light bulb A.
Which bulb will have more electrons flowing through it?
A
A. Bulb A
B. Bulb B
C. Same
D. Impossible to determine
B
Question 5a: Brightness of a light bulb
What determines the brightness of a light
bulb?
A.
B.
C.
D.
Voltage across it
Current through it
Its Resistance
All of the above
Question 5b: Brightness of a light
bulb
What would you do if you wanted to increase the rate at
which electrons (the blue dots) are flowing from the battery
to the light bulb?
A. Increase Resistance and decreases Voltage
B. Increase Resistance and increase Voltage
C. Decrease Resistance and increase Voltage
D. Decrease Resistance and decrease Voltage
Question 5c: Current
What is electric current?
A.
B.
C.
D.
E.
It is the measure of the brightness of a light bulb
It is the strength of a battery or the power supply
It is the number of electrons that flow from a battery
It is the number of electron flowing at a given time from a battery
All of the above