Mains Electricity
Akopọ
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.
Awọn Afojusun
- 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.)
Akọ̀wé Ẹ̀kọ́
O wa lori ohun elo Green Bridge
Gba ohun elo Green Bridge CBT sori foonu tabi kọmputa rẹ lati ri awọn akọsilẹ ẹkọ ni kikun, awọn ibeere adaṣe, ati diẹ sii.
Ìdánwò Ẹ̀kọ́
Oriire fun ipari ẹkọ lori Mains Electricity. Ni bayi ti o ti ṣawari naa awọn imọran bọtini ati awọn imọran, o to akoko lati fi imọ rẹ si idanwo. Ẹka yii nfunni ni ọpọlọpọ awọn adaṣe awọn ibeere ti a ṣe lati fun oye rẹ lokun ati ṣe iranlọwọ fun ọ lati ṣe iwọn oye ohun elo naa.
Iwọ yoo pade adalu awọn iru ibeere, pẹlu awọn ibeere olumulo pupọ, awọn ibeere idahun kukuru, ati awọn ibeere iwe kikọ. Gbogbo ibeere kọọkan ni a ṣe pẹlu iṣaro lati ṣe ayẹwo awọn ẹya oriṣiriṣi ti imọ rẹ ati awọn ogbon ironu pataki.
Lo ise abala yii gege bi anfaani lati mu oye re lori koko-ọrọ naa lagbara ati lati ṣe idanimọ eyikeyi agbegbe ti o le nilo afikun ikẹkọ. Maṣe jẹ ki awọn italaya eyikeyi ti o ba pade da ọ lójú; dipo, wo wọn gẹgẹ bi awọn anfaani fun idagbasoke ati ilọsiwaju.
- 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
O wa lori ohun elo Green Bridge
Gba ohun elo Green Bridge CBT sori foonu tabi kọmputa rẹ lati ri awọn akọsilẹ ẹkọ ni kikun, awọn ibeere adaṣe, ati diẹ sii.
O wa lori ohun elo Green Bridge
Gba ohun elo Green Bridge CBT sori foonu tabi kọmputa rẹ lati ri awọn akọsilẹ ẹkọ ni kikun, awọn ibeere adaṣe, ati diẹ sii.
Awọn Iwe Itọsọna Ti a Gba Nimọran
Ṣe Adaṣe Awọn Ibeere Idanwo Adaṣe
Ṣe o fẹ ṣe adaṣe awọn ibeere idanwo adaṣe nipa Mains Electricity? Ṣe igbasilẹ ohun elo Green Bridge CBT lati wọle si awọn ibeere idanwo adaṣe ati awọn ayẹwo adaṣe kikun fun koko-ọrọ yii.
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