- Current is never used up.
- Current and brightness are similar.
- Current is the opposite to resistance- when one increases, the other decreases.
- Current flows from the posotive terminal of the battery to the negative.
- LDR- in the light- restitance decreases, in the dark- resistance increases.
- Series and parrallel- usually parallel is more useful.
- Short curcuit- wire has no resistance and can become a hazard.
- Diodes- current can only flow in one direction.
- Resistors- increases the resistance so a short curcuit does not occur or prevents a component over heating with too much current.
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- Like poles repel- opposties attract.
- Use bar magnet or iron fillings to observe magnetic field.
- Pattern- out of north and into south
- Magnetic materials- Nickel, iron, colbalt, steel.
- Iron is a good temporary magnet used in electromagnets.
- Steel is good permanent magnet.
- Freely suspended, magnet aligns itself with Earth's north and south poles.
- Current in coil creates an temporary magnet around soft iron core.
- More current= increases strength of magnet.
- Used in bells and scrap yards for extracting metals from non-metals.
- Relay is magnetic switch.
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- Spins on its axis once a day= 24 hours.
- Axis it tilted at 23.5 degrees at its extreme- causes seasons.
- One year= 365 and a quarter days- time for the earth to orbit the sun.
- Moon is the only natural satellite of the earth- 28 days for one orbit.
- Same side of the moon always faces earth.
- Eclipses- Lunar- Moon goes into the earth's shadow, Solar- the moon blocks the sun from view of the earth.
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- The sun is the closest star to earth out of millions in our galaxy.
- The sun is the centre of our dolar system.
- Nuclear fisions provide the sun's energy.
- Our solar system is made up of the sun, nine orbiting planets, comets, asteroids and moons.
- Earth is the only known atmosphere that supports our life form.
- Satellites are kept in orbit by planet's gravitational pull.
- Moons are non-luminous and reflect the sun's light.
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- Light is faster than sound.
- It travels in straight lines from a luminous source.
- Objects around have different properties.
- Opaque- does not let light through, causing a shadow.
- Translucent- lets some light through, is blurred. causes a faint shadow.
- Transparent- lets all the light through, causes barely any shadow.
- Some objects reflect the light, however are not luminous.
- Refraction- the bending of light in a boundary between two mediums and densties- changes direction.
- Dispersion- ehite light splitting into a spectrum.
- Light is a form of energy.
- A light that is invisible to the human eye is called ultraviolet.
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- Slower than light.
- Molecules vibrate and are carried to the ear by sound waves.
- Different animals and humans have different audible ranges.
- Cannot travel through a vacuum- unlike light-needs a substance to carry it.
- Sound travels at different speeds in different mediums.
- Reflection of sound is an echo.
- A sound to high for humans to hear is ultrasound.
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