Sound, Energy, Electricity Flashcards
(30 cards)
What does the height of the wave (called amplitude) tell us about the sound?
Amplitude = Loudness
- A taller wave means a louder sound.
- A shorter wave means a quieter sound.
What does the frequency of a sound wave represent?
Frequency = Pitch
- A high frequency (waves are close together) means a high-pitched sound (like a whistle or bird).
- A low frequency (waves are spread out) means a low-pitched sound (like a drum or bass guitar).
What is constructive interference in sound?
When two sound waves combine to make a louder sound
What is destructive interference in sound?
When two sound waves cancel each other out or make a quieter sound
How do you draw a loud, high-pitched sound wave?
Tall (large amplitude) and squished (high frequency)
What does the conservation of energy mean?
Energy cannot be created or destroyed, only transformed
Name 3 renewable energy sources.
- Solar
- Wind
- Hydro (water)
Name 3 non-renewable energy sources.
- Coal
- Oil
- Natural gas
Give 1 advantage and 1 disadvantage of solar energy.
✅ Clean and renewable. ❌ Depends on sunlight/weather
Give 1 advantage and 1 disadvantage of coal.
✅ Reliable and cheap. ❌ Pollutes and contributes to climate change
What symbol is used for a cell in a circuit diagram?
A short and a long line next to each other (+ and -)
What symbol is used for a resistor?
A rectangle
Where do you place an ammeter in a circuit?
In series with the component (measures current)
Where do you place a voltmeter in a circuit?
In parallel with the component (measures voltage)
In a series circuit, what happens to the current?
It is the same everywhere
In a parallel circuit, what happens to the current?
It splits between branches
What happens when you add more cells in series and parallel?
series: Voltage increases, components may get brighter/faster
parallel: no change in voltage, cells last longer
What happens when you add more lamps in series and parallel?
series: Current decreases, lamps get dimmer
parallel: lamps stay bright total current increases
What is the formula for Ohm’s Law?
R = V ÷ I (Resistance = Voltage ÷ Current)
If V = 6V and I = 2A, what is R?
R = 6 ÷ 2 = 3 Ω
how does resistance affect the current?
More resistance = less current
Less resistance = more current
Resistance slows down the flow of electric current, just like a narrow pipe slows water flow.
what is voltage?
Voltage is the push that makes electric charges move in a circuit.
what is current?
the rate at which charge is flowing
what is resistance?
a material tendency to resist the flow of charge (current)
