Complete these questions on the MOTOR EFFECT...

To experience the full force the wire has to be at __ degrees to the m_______ f____.

The force always acts at r____ a____(s) to the magnetic field of the magnets and to the direction of the c______ in the wire.

If the wire runs parallel to the magnetic field , it wont experience any f____ at all.

The magnetic strength of the force i_______(s) with the strength of the m_______ f____.

Force also increases with the amount of c______ passing through the c________.

(a)  

Complete the equation for Force...

FORCE = M_______ F___ D______ X C______ X L_____

(a)  

What do magnets produce?

(a)  

Complete these sentences on MAGNETS...

Magnetic Fields are shown by magnetic field l___(s). The c_____ the lines are the s_______ the magnetic field. The lines always go from n____ to s____.

Magnetic field is strongest at the p___(s) of a magnet.

(a)  

Complete these sentences about MAGNETS...

Compasses show the d________ of a magnetic field. To draw a magnetic field you move a compass around a m_____ and trace the n_____(s) position to build up a picture of the magnetic field.

(a)  

Complete these sentences on TRANSFORMERS...

Transformers change the size of the p________ d_________of an AC

Two c___(s) joined with an i___ core

Alternating __ is applied across the p______ coil, the i___core magnetises and d__________(s) quickly.

Second coil is part of a c_______ circuit.

Ratio between the number of turns of primary and secondary coil = p________ d_________ of primary and secondary coil.

(a)  

Complete these sentences on LOUDSPEAKERS...

1) AC is sent through a c___ of w___ attached to the base of a p____ c___

2) Coil surrounds one p___ of a permanent magnet and is surrounded by the other. C______ causes a force on coil.

3) Current r______(s), the force acts in the o_______ direction

4) Variations in the current make core v______. A__ around the core vibrates and creates vibrations in p_______ that cause a sound wave.

5) F________ of sound wave = F________ of AC

(a)  

Complete these sentences on MICROPHONES...

1) Sound waves hit a flexible d________ that is attached to a c___ of w___

2) This causes the coil to m___ in the m_______ f____, which generates a c______

3) Movement of the coil depends on the p________(s) of the sound wave

4) Microphones can convert the p_______ variations of a sound wave into variations in the c______ in an e_______ circuit

(a)  

Complete these sentences on ALTERNATORS...

Alternators generate __.

Generators r_____ a c___ in a magnetic field. As the c___/magnet spins, a c______ is induced in the c___. Current changes direction every h___ turn.

No split ring c_________.

(a)  

Complete these questions on DYNAMOS...

Dynamos generate __.

S____ ring commutator

Swaps c_________ every h___ turn.

O___________ to see the generated __.

AC line goes __ and ____

DC stays above the a___

(a)  

Complete these sentences on THE GENERATOR EFFECT...

The generator effect is the induction of a p________ d__________ (and c______ of there is a complete circuit) in a w___, which is expressing a change in m_______ f____.

(a)  

Complete these sentences on The Generator Effect...

Generator effect induces a __ in a c________ by moving a m_____ in a coil of w___ or moving a c________ in a magnetic field.

If you move the magnet/conductor in the opposite direction then the pd/current will be r_______.

If the polarity of magnet is reversed then the pd/current will r______ too.

If you keep magnet/coil moving back and forward the PD will keep s_______ d________, which produces __.

(a)  

Complete these sentences on The Generator Effect...

To turn a magnet end to end in a coil you have to: -

-Turn magnet = Magnetic field through the coil c_____(s), which induces a p________ d_________ (c______ flows in the wire)

-Magnet moves through a half turn = d_________ of the magnetic field through the coil r______(s). PD reverses, so current flows in the o_______ d________ around coil.

(a)  

Complete these sentences on ELECTRIC MOTORS...

1) Force act on the two side a__(s) of a coil of wire that are carrying a c______

2) Force acts on any current in m_______ f____

3) Coil is on the a___ and force acts one __ and one ____ (R_____(s))

4) Split-ring commutator s___(s) the contacts every h___ turn to keep the motor r_______ in the same direction

Direction of motor can be reversed by swapping p_______ of dc supply or swapping m_______ p___(s) over.

(a)  

The MOTOR EFFECT is when a c______ carrying wire is put between m_______ p___(s) and the magnetic field around the wires i_______(s) with the magnetic field it is placed in.

Magnet and Conductor e____ a f____ on each other.

(a)  

Magnetic Flux Density is how many f____ l___(s) there are in a r_____.

(a)  

Complete these sentences on ELECTROMAGNETS...

A solenoid increases the s_______ of the magnetic field by w_______ the wire into a coil.

This happens because the field lines around each l___of wire line up with each other.

The magnetic field inside a solenoid is s_____ and u______ (same s_______ and d________).

You can increase the field strength of a solenoid by putting a block of i___ in the centre.

Solenoid + Iron Sylvia = E____________

(a)  

Complete these sentences on MAGNETISM...

Permanent - Produce their own m_______ f____

Induced - Magnetic materials that turn into a m_____ when they are put in a m_______ f____.

(a)  

Complete these sentences on MAGNETISM...

Moving Charges...

-Current flows through a w___. Magnetic field is created a_____ the wire

-Field is made up of c_________ c_____(s) perpendicular to the wire

-Changing direction of the current changes the direction of the m_______ f____

-Strength of magnetic field produced changes with the c______ and d_______ from the wire

(a)