The Motor Effect
Akopọ
Stop reading for a moment and count the electric motors within ten metres of you. The fan in a laptop. The buzz in a phone. The pump in a fridge, the drum of a washing machine, the passenger window of a car, the disc that spins a hard drive, the wipers, the fuel pump. A family car carries more than thirty and almost nobody could name five. Every one runs on a single idea small enough to fit in a sentence: put a current through a wire that is already sitting in a magnetic field, and something shoves the wire sideways.
This lesson is about that shove. You will find out where it comes from, why it acts sideways to both the current and the field rather than along either, and why the magnet gets shoved just as hard the other way. You will learn to read a force direction straight off an arrangement with nothing but your own left hand, a skill the specification names outright. Then you will bend the wire into a loop and watch a push turn into a spin, which is the whole of an electric motor in one step. One thing has to be said before any of it: on this course every single statement of this topic is printed in bold type, which means the whole of it is Extension Tier material. The next section explains exactly what that does and does not mean for you.
Awọn Afojusun
- A current carrying conductor has a magnetic field around the wire. When a current carrying conductor is placed in a magnetic field so that it cuts lines of magnetic force, the magnet and the conductor exert a force on each other. This is called the motor effect. The conductor will not experience a force if it is parallel to the magnetic field.
- The size of the force can be increased by: increasing the strength of the magnetic field; increasing the size of the current; increasing the length of the conductor in the magnetic field.
- The direction of the force is reversed if either the direction of the current or the direction of the magnetic field is reversed. Students should be able to identify the direction of the force using Flemings left-hand rule.
- A coil of wire carrying a current in a magnetic field tends to rotate. This is the basis of an electric motor.
Àwòrán ọpọlọ
A ti ṣe àwòrán kókó yìí kí o lè rí bí àwọn èrò ṣe so pọ̀.
Ṣí àwòrán ọpọlọ nínú áàpù
Akọ̀wé Ẹ̀kọ́
Àkọsílẹ̀ Ẹ̀kọ́ Pípé wà lórí Ohun Èlò Green Bridge
Gba ohun èlò Green Bridge CBT sórí fóònù tàbí kọ̀mpútà rẹ fún gbogbo ilé ìkàwé IGCSE: ìwé ìdánwò àtijọ́, ìlànà ìdíwọ̀n, àwòrán èrò, káàdì ìkẹ́kọ̀ọ́ àti ẹ̀kọ́ ohùn.
Ìdánwò Ẹ̀kọ́
Oriire fun ipari ẹkọ lori The Motor Effect. 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.
- In Fleming's left-hand rule, what does the first finger point along? A. The direction of the force on the conductor B. The direction of the magnetic field C. The direction of the conventional current D. The direction of the flow of electrons Answer: B
- A straight wire lies between the poles of a magnet, parallel to the magnetic field lines. A large current is passed through the wire. What force acts on the wire? A. No force at all B. A force at right angles to the field C. A force along the direction of the current D. A force twice the size of the force when the wire is at right angles to the field Answer: A
- Which change would NOT increase the size of the force on a current-carrying wire in a magnetic field? A. Using a stronger magnetic field B. Increasing the current in the wire C. Increasing the length of the wire that lies inside the field D. Turning the wire so that it lies along the magnetic field lines Answer: D
- The current in a wire in a magnetic field is reversed, and the magnet is also turned round so that its poles trade places. What happens to the direction of the force on the wire? A. It is reversed B. It is unchanged C. It becomes zero D. It turns through 90 degrees Answer: B
- Why does a rectangular coil carrying a current in a magnetic field tend to rotate? A. Its two long sides carry current in opposite directions, so they are pushed in opposite directions on opposite sides of the axle B. Its two long sides carry current in the same direction, so they are pushed the same way C. The magnet is attracted to the coil D. The coil becomes an induced magnet and is attracted to the pole faces Answer: A
Ṣiṣẹ́ lórí àwọn ìbéèrè wọ̀nyí nínú ohun èlò náà
Ṣiṣẹ́ lórí àwọn ìbéèrè wọ̀nyí nínú ohun èlò náà
Awọn Iwe Itọsọna Ti a Gba Nimọran
Ṣe Adaṣe Awọn Ibeere Idanwo Adaṣe
Ṣe o fẹ ṣe adaṣe awọn ibeere idanwo adaṣe nipa The Motor Effect? Ṣe igbasilẹ ohun elo Green Bridge CBT lati wọle si awọn ibeere idanwo adaṣe ati awọn ayẹwo adaṣe kikun fun koko-ọrọ yii.
Ṣe igbasilẹ ohun elo naa lori Google Playstore
Gbogbo ohun ti o nilo lati ṣe dara julọ ninu JAMB, WAEC ati NECO.
