| Front | CapacitanceFunctions of capacitors in electrical circuits [3] |
| Back | - smoothing - blocks d.c. - surge protection - temporary power supply (stores electrical energy) - timing / delaying - tuning - oscillator |
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| Front | Astronomy and cosmologyDefine luminosity |
| Back | The total power of radiation emitted by a star. |
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| Front | Astronomy and cosmologyEquation relating the age of the universe to the hubble constant. |
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