6.17 describe the structure of a transformer, and understand that a transformer changes the size of an alternating voltage by having different numbers of turns on the input and output sides A transformer is a device that helps to reduce or increase voltage in a wire...
6.18 explain the use of step-up and step-down transformers in the large- scale generation and transmission of electrical energy A transformer that is used to increase voltage is called step-up transformer. One that is used to decrease voltages is called step-down...
6.19 know and use the relationship between input (primary) and output (secondary) voltages and the turns ratio for a transformer input(primary)voltage / output(secondary)voltage = primary turns / secondary turns Vp/Vs=np/ns
6.20 know and use the relationship: for 100% efficiency Input power = output power VP IP = VS IS
6.16 describe the generation of electricity by the rotation of a magnet within a coil of wire and of a coil of wire within a magnetic field and describe the factors which affect the size of the induced voltage We can generate a voltage and current by pushing a magnet...
6.10 sketch and recognize magnetic field patterns for a straight wire, a flat circular coil and a solenoid when each is carrying a current A field around a straight wire is simply a series of circles around the wire. A field around a solidness is similar to that of a...
6.9 describe the construction of electromagnets If a temporary magnet is wrapped with a wire into a coil and pass current to it, the magnet will become magnetized. This way electromagnets can be constructed.
6.4 understand the term ‘magnetic field line’ Magnetic field line is imaginary line which represents where the magnetism is acting. Magnetic field line starts from north pole to south pole.
6.11 understand that there is a force on a charged particle when it moves in a magnetic field as long as its motion is not parallel to the field A charged particle moving through a magnetic field experiences a force, as long its motion is not parallel to the field. If...
6.12 understand that a force is exerted on a current-carrying wire in a magnetic field, and how this effect is applied in simple d.c. electric motors and loudspeakers As current passes around the loop of wire, one side of it will experience a force pushing it upwards....
6.13 use the left hand rule to predict the direction of the resulting force when a wire carries a current perpendicular to a magnetic field The left hand rules shows the direction of force, magnetic field and current when a wire carries a current perpendicularly to a...
6.14 describe how the force on a current-carrying conductor in a magnetic field increases with the strength of the field and with the current Ways to increase the force produced in motors: Increase the number of turns or loops of wire Increase the strength of magnetic...
6.15 understand that a voltage is induced in a conductor or a coil when it moves through a magnetic field or when a magnetic field changes through it and describe the factors which affect the size of the induced voltage If we move a wire across a magnetic field at...
6.6 describe experiments to investigate the magnetic field pattern for a permanent bar magnet and that between two bar magnets Using a compass moving around the magnet you can detect the magnetic field pattern. As you move so the needle will move. The compass can show...
6.7 describe how to use two permanent magnets to produce a uniform magnetic field pattern If you put two bar magnets together with their north and south touching, then they will form the same magnetic field as if there were one bar magnet.
6.1 use the following units: ampere (A), volt (V), watt (W) Unit of current: ampere (A) Unit of potential difference: volt (V) Unit of power: watt (W)
6.2 understand that magnets repel and attract other magnets and attract magnetic substances Magnets are able to attract objects made from magnetic materials such as iron, steel, etc. Other objects like plastic, rubber are non-magnetic substance. They can attract...
6.3 describe the properties of magnetically hard and soft materials Magnetically hard materials: Needs time to become magnetized Once magnetized, the magnetism remains permanently Magnets with magnetically hard materials are known as permanent magnets Eg: Steel...
6.5 understand that magnetism is induced in some materials when they are placed in a magnetic field If you keep a material between the magnetic field, eventually after a period of time, that material will be magnetized.