| Quiz | Magnetism and electromagnetism |
|---|---|
| Name | |
| Result | PASSED |
| Score | 25 / 26 (96.2%) |
| Passing score | 20.8 |
| Quiz took | 9 min 52 sec |
| Quiz finished at | 2022-10-21 12:11:19 |
When a current cuts through a magnetic field, you can find which way the force will act using
The magnetic field around a wire with a current running through it, can represented using
An electric motor converts
AC generators use ___________ . Therefore, the contacts do not swap every half turn and an alternating potential difference is produced.
Which of the following generates alternating current?
Which of the following would not increase the size of the induced potential difference in a generator?
A coil of wire can also be called a
Which of these is not a magnetic element?
In order to swap the contacts every half turn in a motor, we can use
Transformers consist of two coils and
The national grid uses step-up transformers to transmit power at __________ , as this wastes less energy as heat and is a more efficient way to transmit power.
Which of the following can be used to change the size of the potential difference?
Which of the following generates direct current?
The frequency of a sound wave from a loudspeaker is controlled by the
Magnetic flux density can be measured in
A basic loudspeaker can be made from an electromagnet and
The closer together field lines are, the _______ the magnetic field is
Which of the following converts pressure variations of a sound wave into variations in current in an electric current?
____________ can be used to decrease the potential difference.
An electromagnet is made using a solenoid and
____________ can be used to increase the potential difference.
A generator converts
There is a 230 V potential difference across the primary coil of a transformer and a 9 A current through this primary coil. There is a 12 A current through the secondary coil of the transformer. Calculate the potential difference across the secondary coil of the transformer.
Transformers only work with
When magnetic materials are put into a magnetic field, a magnet can be
A 230 V potential difference is input into a transformer. The transformer has 50 turns on the primary coil and 120 turns on the secondary coil. Calculate the output potential difference.