Sound, energy and electricity Flashcards
Memorise (20 cards)
What is voltage?
Voltage (potential difference) is the push that makes electric charges move. Measured in volts (V).
What is current?
Current is the flow of electric charge in a circuit. Measured in amperes (A).
What is resistance?
Resistance is how much a component resists the flow of current. Measured in ohms (Ω).
What is Ohm’s Law?
Ohm’s Law: V = I × R
V = Voltage, I = Current, R = Resistance
What happens when you add a cell in series?
More voltage, more current.
What happens when you add a cell in parallel?
No change in voltage, cells last longer.
What happens when you add a lamp in series?
More resistance, lamps become dimmer.
What happens when you add a lamp in parallel?
Lamps stay bright, total current increases.
How is current measured in a series circuit?
The current is the same everywhere.
How is current measured in a parallel circuit?
It splits between branches.
How is voltage shared in a parallel circuit?
It is the same across each branch.
How is voltage shared in a series circuit?
It is shared between components.
What is sound?
Sound is a type of energy made by vibrations that travel through a medium (air, water, or solids).
What type of wave is a sound wave?
A longitudinal wave, where particles vibrate in the direction the wave travels.
What is frequency?
Frequency is the number of sound waves per second, measured in hertz (Hz).
What is the audible range for human hearing?
20 Hz to 20,000 Hz.
What is pitch?
Pitch is how high or low a sound is. It depends on the wave’s frequency.
What is volume (loudness)?
volume depends on amplitude. Greater amplitude = louder sound.
What happens to pitch if frequency increases?
The pitch becomes higher.
What happens to pitch if frequency decreases?
The pitch becomes lower.
