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Physics data booklet 5. Q = Energy/heat. m = Mass. c = Specific heat capacity. T = Temperature. L = Specific latent heat. Energy/heat given/received in changing an object’s temperature. Energy/heat given/received in changing an object’s phase. p = Pressure. F = Force. A = Area. n = Number of moles. N = Number of atoms. NA = Avogadro’s ...
By the end of this section, you will be able to: Express electrical power in terms of the voltage and the current. Describe the power dissipated by a resistor in an electric circuit. Calculate the energy efficiency and cost effectiveness of appliances and equipment.
A.3 Work, energy and power WF= scosθ E p k m!! 1 22 2 2 mv ∆∆Em p = gh Ek H = 1 2 ∆x2 P W t ==Fv ∆ ∆ η== useful work out total work in useful power out total power in 6 Physics data booklet s: displacement u: initial velocity v: final velocity a: acceleration t: time (Use + or - to include direction) F H: elastic force from helical ...
For example, when a current flows in a conductor, electrical energy is converted into thermal energy within the conductor. The electrical field, supplied by the voltage source, accelerates the free electrons, increasing their kinetic energy for a short time.
Define electric power and describe the electric power equation; Calculate electric power in circuits of resistors in series, parallel, and complex arrangements
Electric energy depends on both the voltage involved and the charge moved. This is expressed most simply as PE = qV PE = qV, where q q is the charge moved and V V is the voltage (or more precisely, the potential difference the charge moves through). Power is the rate at which energy is moved, and so electric power is
The electric field between two charged objects is stronger if the objects are closer together. Sparks are more likely to occur in stronger electric fields. 8. The rate that lightning strikes should increase. When the cloud passes over a hill, the distance between it and the ground becomes smaller – this creates a stronger electric field.
