20 questions
What flows in a circuit to generate a current?
Protons
Electrons
Neutrons
Elements
What are shop owners now using in their electronics so that one outage will not cause the device to break?
parallel circuits
series circuits
electric circuits
open circuits
With a 900 V source, voltage is divided across 3 series resistors of 300 V, 280 V, and:
30V
320V
900V
270V
Resistance in a series circuit will:
double the current.
control the voltage.
halve the power.
oppose current.
What’s the difference between series and parallel circuits?
The number of lights used
Whether the lights are in a line or in a circle
The path that the current takes through the circuit
The number of resistors used
Calculate the resistance of the filament of a 40 Watt lightbulb if it draws 3 amperes when 120 V are impressed across it.
0.025 ohms
13 ohms
40 ohms
360 ohms
In this circuit, how do the bulbs compare in terms of brightness?
All three bulbs have equal brightness.
Bulb 1 is brighter than bulb 2 which is brighter than bulb 3.
Bulb 3 is brighter than bulb 2 which is brighter than bulb 1.
Bulb 1 is brighter than bulb 3 which is brighter than bulb 2.
Which one is NOT correct about current?
Current is the movement of electricity.
We can measure how strong or weak the current is.
The unit of measurement for the current is called ohm.
Current flows through wires of an electric circuit.
[True/False] The lemon/potato battery produces electricity by converting chemical energy to electrical energy.
True
False
What kind of circuit is this?
Series
Consecutive
Parallel
Open
What kind of circuit is this?
Series
Consecutive
Parallel
Open
When gears are equal in size, what is the gear ratio?
2:1
1:3
1:1
2:5
Gear reduction is seen as a fraction that is often reduced to simplify the expression. Gear reduction: 40 / 12 gets reduced to
20/6
10/3
80/24
30/9
When on a bike going uphill, what happens to the speed and torque?
Speed decreases; torques increases
Speed decreases; torques decreases
Speed increases; torques decreases
Speed increases; torques increases
A gear ratio is defined as which of the following?
Driven gear : Driving gear
gear shape : gear shape
Speed : torque
Driving gear : Driven gear
If you turn gear 2 in a clockwise direction, which of the following gears will also be turning clockwise?
1
3
4
5
The __________ Gear causes motion.
Driven
Driving
Biggest
Smallest
What is the function of the smaller gear?
Makes the output gear turn slower.
Makes the output gear turn faster.
Makes the larger gears turn in opposite directions.
Makes the larger gears turn in the same direction.
# of teeth driven gear = 36
# of teeth driving gear = 12
What is the gear ratio? Hint: GR=DRIVEN/DRIVING
36:12 (3:1)
12:36 (1:3)
36:36 (1:1)
12:12 (1:1)
What is the Gear Ratio of a driven gear with 8 teeth and a driving gear with 32 teeth? Hint: GR=DRIVEN/DRIVING
4
1/4
0.4
8