SCIENCE 10-EVALUATION

A device that converts mechanical energy into electrical energy.

• motor

• rotor

• generator

• detector

A device that converts electrical energy into mechanical energy.

• motor

• rotor

• generator

• detector

Washing machines, ceiling fans and electric drills are just some of the many examples of this device.

• rotor

• motor

• generator

• detector

What transformation can take place in an improvised generator?

• mechanical energy into electrical energy

• electrical energy into mechanical energy

• alternating current into direct current

• direct current into alternating current

The refrigerator has become in demand in this time of pandemic because people tend to stock food and stay at home as number one precautionary measure to protect themselves against Covid-19. What do you call the device that converts electrical energy into mechanical energy to make these appliances work?

• Electric motor

• Electric generator

• Electric current

• Electric device

What part of an electric motor includes the rotating magnets (or aluminum bars), the shaft, and any object which moves when the motor is working?

• Armature

• Field magnet

• Commutator

• Rotor

The working principle of an electric motor is based on a fact that a current carrying conductor produces a magnetic field around it. Which of the following describes an electric motor?

• An electric motor is used to convert mechanical energy into electrical energy

• An electric motor is used to convert electrical energy into mechanical energy.

• Electric motor takes resistance & current and transforms it into force and velocity.

• Electric motor takes resistance & voltage and transforms it into force and velocity.

According to Faraday's law, the induced voltage is proportional to ________________.

• the product of its number of loops

• the rate at which the magnetic field changes within loops

• both of these

• none of these

The greater the amount of loops you have ____________________________.

• the less voltage

• the greater the voltage

• the voltage stays the same

• there is no change

Which of the following is NOT an application of electromagnetic induction?

• Generating electricity

• Energy efficient motors

• Energy efficient cookers and burners

• Using a magnet to separate scrap metal parts