Energy And Voltage In Circuits
Gbogbo ọrọ náà
Every electrical device you use, from a phone charger to a hospital ventilator, relies on charges moving through circuits and transferring energy along the way. Understanding how current, voltage and resistance relate to each other is the key to predicting what any circuit will do, and it is one of the most heavily examined areas of your Edexcel course.
You will learn the equations that connect charge, current and time, explore how voltage measures energy transfer per coulomb, and master Ohm's law. You will also discover how different components behave, from resistors that obey a straight-line rule to diodes that only conduct one way, and see why homes use parallel circuits while fairy lights use series.
Ebumnobi
- Explain why a series or parallel circuit is more appropriate for particular applications, including domestic lighting
- Understand how the current in a series circuit depends on the applied voltage and the number and nature of other components
- Describe how current varies with voltage in wires, resistors, metal filament lamps and diodes, and how to investigate this experimentally
- Describe the qualitative effect of changing resistance on the current in a circuit
- Describe the qualitative variation of resistance of light-dependent resistors (LDRs) with illumination and thermistors with temperature
- Know that lamps and LEDs can be used to indicate the presence of a current in a circuit
- Know and use the relationship between voltage, current and resistance: voltage = current x resistance, V = I x R
- Know that current is the rate of flow of charge
- Know and use the relationship between charge, current and time: charge = current x time, Q = I x t
- Know that electric current in solid metallic conductors is a flow of negatively charged electrons
- Understand why current is conserved at a junction in a circuit
- Know that the voltage across two components connected in parallel is the same
- Calculate the currents, voltages and resistances of two resistive components connected in a series circuit
- Know that voltage is the energy transferred per unit charge passed and that the volt is a joule per coulomb
- Know and use the relationship between energy transferred, charge and voltage: energy transferred = charge x voltage, E = Q x V
Maapụ uche
E seela isiokwu a ka ị hụ otu echiche si ejikọta.
Mepee maapụ uche na ngwa
Kaadị ncheta
Omume ncheta ngwa ngwa n'ihe a na-anwale n'isiokwu a.
Mee omume kaadị ndị a na ngwa
Akwụkwọ Ọmụmụ
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Nnyocha Ọmụmụ
Ekele diri gi maka imecha ihe karịrị na Energy And Voltage In Circuits. Ugbu a na ị na-enyochakwa isi echiche na echiche ndị dị mkpa, ọ bụ oge iji nwalee ihe ị ma. Ngwa a na-enye ụdị ajụjụ ọmụmụ dị iche iche emebere iji kwado nghọta gị wee nyere gị aka ịmata otú ị ghọtara ihe ndị a kụziri.
Ị ga-ahụ ngwakọta nke ụdị ajụjụ dị iche iche, gụnyere ajụjụ chọrọ ịhọrọ otu n’ime ọtụtụ azịza, ajụjụ chọrọ mkpirisi azịza, na ajụjụ ede ede. A na-arụpụta ajụjụ ọ bụla nke ọma iji nwalee akụkụ dị iche iche nke ihe ọmụma gị na nkà nke ịtụgharị uche.
Jiri akụkụ a nke nyocha ka ohere iji kụziere ihe ị matara banyere isiokwu ahụ ma chọpụta ebe ọ bụla ị nwere ike ịchọ ọmụmụ ihe ọzọ. Ekwela ka nsogbu ọ bụla ị na-eche ihu mee ka ị daa mba; kama, lee ha anya dị ka ohere maka ịzụlite onwe gị na imeziwanye.
- What does electric current measure? A) The energy stored in a battery B) The rate of flow of charge C) The resistance of a wire D) The voltage across a component Answer: B
- A charge of 60 C passes through a lamp in 20 s. What is the current? A) 1200 A B) 80 A C) 3 A D) 0.33 A Answer: C
- Which I-V graph is a straight line through the origin? A) Filament lamp B) Diode C) Fixed resistor D) Thermistor Answer: C
- In a parallel circuit, what happens to the voltage across each branch? A) It is shared equally B) It is the same as the supply voltage C) It decreases along each branch D) It depends on the current Answer: B
- What happens to the resistance of a thermistor as temperature increases? A) It increases B) It decreases C) It stays the same D) It drops to zero Answer: B
Rue ajuju ndi a n'ime ngwa ahu
Rue ajuju ndi a n'ime ngwa ahu
Akwụkwọ A Na-atụ Aro
Mụtakwuo ihe site na isi mmalite mepere emepe
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Akụkụ akwụkwọ
Ohm’s Law: Resistance and Simple Circuits
What drives current? We can think of various devices—such as batteries, generators, wall outlets, and so on—which are necessary to maintain a current. All such devices create a potential difference and are loosely referred to as voltage sources. When a voltage source is connected to a conductor, it
"College Physics: Ohm’s Law: Resistance and Simple Circuits" by OpenStax, OpenStax, Rice University, licensed under CC BY 4.0 (https://creativecommons.org/licenses/by/4.0/). Source: https://openstax.org/books/college-physics/pages/20-2-ohms-law-resistance-and-simple-circuits. Access for free at https://openstax.org/books/college-physics/pages/1-introduction
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Akụkụ akwụkwọ
Resistors in Series and Parallel
Most circuits have more than one component, called a resistor that limits the flow of charge in the circuit. A measure of this limit on charge flow is called resistance . The simplest combinations of resistors are the series and parallel connections illustrated in Figure 21.2 . The total resistance
"College Physics: Resistors in Series and Parallel" by OpenStax, OpenStax, Rice University, licensed under CC BY 4.0 (https://creativecommons.org/licenses/by/4.0/). Source: https://openstax.org/books/college-physics/pages/21-1-resistors-in-series-and-parallel. Access for free at https://openstax.org/books/college-physics/pages/1-introduction
Ndị otu ndị ọzọ bipụtara ha n'okpuru ikike mepere emepe, anyị na-ekele ha dị ka ha si chọọ. Njikọ na-emepe saịtị ha.
Meecha Ajụjụ Ule Ọmarịcha
Ị chọrọ ime ajụjụ ule ọmarịcha gbasara Energy And Voltage In Circuits? Budata ngwa Green Bridge CBT iji nweta ajụjụ ule ọmarịcha na nyocha zuru ezu gbasara isiokwu a.
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