Mains Electricity
Gbogbo ọrọ náà
The mains supply powers almost every appliance in your home. Understanding how it works and the safety features that protect you is both practically useful and a key part of the Edexcel specification.
In this lesson you will learn the difference between a.c. and d.c., how insulation, earthing, fuses and circuit breakers keep you safe, why resistors heat up, and how to calculate electrical power and energy transferred.
Ebumnobi
- Understand how the use of insulation, double insulation, earthing, fuses and circuit breakers protects the device or user
- Understand why a current in a resistor results in the electrical transfer of energy and an increase in temperature
- Know and use the relationship: power = current x voltage
- Use the relationship: energy transferred = current x voltage x time
- Know the difference between mains electricity being alternating current (a.c.) and direct current (d.c.)
Akọmọ Ojú-ẹkọ
Ọ dị na ngwa Green Bridge
Budata ngwa Green Bridge CBT na ekwentị maọbụ kọmputa gị iji nweta akwụkwọ ndụmọdụ zuru oke, ajụjụ mmụta, na ndị ọzọ.
Ayẹwo Ẹkọ
Ekele diri gi maka imecha ihe karịrị na Mains Electricity. 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.
- Mains electricity is: A) D.C. B) A.C. C) 12 V D) Battery powered Answer: B
- A fuse protects by: A) Increasing current B) Melting and breaking the circuit C) Increasing resistance D) Reversing current Answer: B
- P = IV. If I = 3 A and V = 230 V, power is: A) 690 W B) 233 W C) 69 W D) 6900 W Answer: A
- Double-insulated appliances do not need: A) A fuse B) A plug C) An earth wire D) Insulation Answer: C
- Energy transferred E = IVt. If I = 2 A, V = 12 V, t = 60 s: A) 1440 J B) 144 J C) 24 J D) 720 J Answer: A
Ọ dị na ngwa Green Bridge
Budata ngwa Green Bridge CBT na ekwentị maọbụ kọmputa gị iji nweta akwụkwọ ndụmọdụ zuru oke, ajụjụ mmụta, na ndị ọzọ.
Ọ dị na ngwa Green Bridge
Budata ngwa Green Bridge CBT na ekwentị maọbụ kọmputa gị iji nweta akwụkwọ ndụmọdụ zuru oke, ajụjụ mmụta, na ndị ọzọ.
Àwọn Ìwé Tó Dáa Láti Kà
Meecha Ajụjụ Ule Ọmarịcha
Ị chọrọ ime ajụjụ ule ọmarịcha gbasara Mains Electricity? Budata ngwa Green Bridge CBT iji nweta ajụjụ ule ọmarịcha na nyocha zuru ezu gbasara isiokwu a.
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