Electricity
Electricity is a secondary energy source converted from what type of sources?
What is Primary energy sources (coal, natural gas, nuclear, solar, etc.)
What type of current flows in one direction only?
what is Direct current (DC)
A voltmeter is connected across a battery with a higher range than needed.
Question:
Why is choosing the correct voltmeter range important?
What is To obtain an accurate measurement
What is the lowest point of a wave called?
What is Trough.
In which wave do particles move parallel to the direction of energy transfer?
What is Longitudinal wave.
What charged particles move to create electric current?
What is Electrons.
What type of current changes direction regularly?
what is Alternating current (AC)
A circuit has a potential difference of 6 V and a resistance of 3 Ω.
Question:
What is the current in the circuit?
What is 2 A
What does wavelength measure?
What is The distance between two matching points on a wave (crest to crest).
Sound waves are an example of which wave type?
What is Longitudinal waves.
Why is rubber used to cover electrical wires?
What is It is an insulator that prevents electric shock.
Which instrument measures electric current?
what is Ammeter.
A student increases the temperature of a metal wire while keeping the voltage constant.
Question:
What happens to the current, and why?
Current decreases because resistance increases
A student turns up the volume on a speaker.
Question:
Which wave property changes?
What is Amplitude
Name one part of a longitudinal wave.
What is Compression or rarefaction.
Compare electrical conductivity of metals and wood.
What is Metals conduct electricity well; wood does not.
How does increasing resistance affect current?
What is Current decreases.
A student connects a battery, switch, and bulb. When the switch is closed, the bulb lights. When the battery is replaced with a power outlet, the bulb breaks.
Question:
What is the most likely reason?
What is AC changes direction and can damage devices not designed for it
An ambulance passes by, and the siren sounds higher in pitch as it approaches.
Question:
What wave property is changing?
What is Frequency
A student uses a mobile phone to make a call while traveling on a train. The signal continues to work even when the train passes through areas with no air
What is Electromagnetic waves can travel through a vacuum
Electric Potential or potential is measured in?
What is Volts
Using the water tank model, what represents resistance?
What is The narrowness or obstacle of the pipe.
A house uses electricity from solar panels during the day.
Question:
Why must the electricity from solar panels be converted before being used in homes?
What is Solar panels produce DC but homes use AC
Two students observe waves in a slinky. One wave has a larger amplitude than the other.
Question:
Which wave carries more energy, and why?
What is The larger wave, because it has greater amplitude
Doctors use X-rays to look inside the human body.
Question:
Why are X-rays useful for this purpose?
They can pass through soft tissue but not dense materials