Term
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Definition
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Term
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Definition
| 1 C is the charge transferred in 1 second by a current of 1 amp |
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Term
| Potential difference (p.d.) |
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Definition
| The electrical energy transferred per unit charge when electrical energy is converted into another form of energy |
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Term
| Electromotive force (e.m.f.) |
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Definition
| The energy transferred per unit charge when another type of energy is converted into electrical energy |
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Term
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Definition
| 1 V is 1 joule per coulomb |
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Term
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Definition
| Resistance is potential difference per unit current |
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Term
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Definition
| 1 ohm is the resistance when 1 volt of potential difference produces 1 ampere of current |
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Term
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Definition
| resistivity = (resistance * cross-sectional area)/length |
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Term
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Definition
| 1 kWh is the energy transferred by a 1 kW device in a time of 1 hour |
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Term
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Definition
| The potential difference across the total external resistance connected to an e.m.f. source |
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Term
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Definition
| A wave that carries energy from one place to another |
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Term
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Definition
| A wave in which the oscillation is perpendicular to the direction of travel of the wave |
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Term
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Definition
| A wave in which particles oscillate parallel to the direction of travel of the wave |
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Term
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Definition
| A point on a stationary wave where the amplitude is zero |
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Term
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Definition
| A point on a stationary wave where the amplitude is a maximum |
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Term
| Principle of Superposition |
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Definition
| When two or more waves of the same type are in the same place at the same time, the resultant displacement is the sum of the displacements of the individual waves |
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Term
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Definition
| The maximum displacement of any point on a wave from its equilibrium position; it is always positive |
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Term
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Definition
| The smallest distance from a point on a wave and a similar point on the next wave |
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Term
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Definition
| The time taken for one complete oscillation of a point on a wave |
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Term
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Definition
| The number of oscillations per unit time of any point |
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Term
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Definition
| 1 eV is the energy change of an electron when it moves through a potential difference of one volt |
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Term
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Definition
| The minimum energy required to release an electron from the surface of a metal |
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Term
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Definition
| The minimum frequency of electromagnetic radiation required to release an electron from the surface of a metal |
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Term
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Definition
| The average velocity of a charge carrier as it travels through a medium due to a potential difference. |
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Term
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Definition
| The current through a conductor is proportional to the potential difference across it at a constant temperature |
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Term
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Definition
| The distance any part of the wave has moved from its mean position; it can be positive or negative. |
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Term
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Definition
| Angular difference by which one wave or particle leads or lags behind another |
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Term
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Definition
| The distance moved by the wave per unit time |
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Term
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Definition
| Waves with a constant phase difference (same frequency) |
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Term
| Fundamental mode of vibration |
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Definition
| The lowest frequency stationary wave for a particular system |
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Term
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Definition
| Stationary waves for a particular system with higher frequencies than the fundamental |
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Term
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Definition
| Direction is from positive to negative |
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Term
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Definition
| The sum of current entering any point in a circuit is equal to the sum of the currents leaving that same point |
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Term
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Definition
| The sum of e.m.f.s round a loop in a circuit is equal to the sum of p.d.s in that same loop |
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Term
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Definition
| The rate of energy transfer |
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Term
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Definition
| The bouncing back of a wave from a surface |
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Term
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Definition
| The change in direction of a wave as it crosses an interface between two materials where its speed changes |
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Term
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Definition
| The spreading of a wave when it passes through a gap or past the edge of an object |
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Term
| Typical wavelength of radio waves |
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Definition
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Term
| Typical wavelength of microwaves |
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Definition
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Term
| Typical wavelength of infra-red radiation |
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Definition
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Term
| Typical wavelength of visible light |
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Definition
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Term
| Typical wavelength of ultra-violet radiation |
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Definition
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Term
| Typical wavelength of X-rays |
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Definition
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Term
| Typical wavelength of gamma radiation |
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Definition
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Term
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Definition
| A transverse wave that oscillates in only one plane |
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Term
| Constructive interference |
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Definition
| When two or more waves meet in phase; the amplitudes add |
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Term
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Definition
| when two or more waves meet in anti-phase; the amplitudes subtract |
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