Understanding Electric Circuits and Motors

What is Ohm's Law?

In a series circuit, the total resistance is:

• The sum of the individual resistances

• The reciprocal of the sum of the reciprocals of the individual resistances

• Equal to the largest resistance

• Equal to the smallest resistance

Which of the following is true for a parallel circuit?

• The current is the same through all components

• The voltage is the same across all components

• The total resistance is the sum of the individual resistances

• The power is the same across all components

What is the main difference between AC and DC motors?

• AC motors use alternating current, while DC motors use direct current

• AC motors are more efficient than DC motors

• DC motors are used for high-speed applications

• AC motors are smaller than DC motors

Electromagnetic induction is the process of:

• Generating electric current from a magnetic field

• Generating a magnetic field from electric current

• Converting AC to DC

• Converting DC to AC

Which of the following factors affects motor efficiency?

• The colour of the motor

• The weight of the motor

• The load on the motor

• The temperature of the room

What is the function of a resistor in a circuit?

• To store electrical energy

• To increase the current

• To oppose the flow of current

• To convert electrical energy into light

In a series circuit with a 10 ohm and a 20 ohm resistor, what is the total resistance?

• 10 ohms

• 20 ohms

• 30 ohms

• 5 ohms

If a circuit has a total voltage of 12V and a total resistance of 4 ohms, what is the current flowing through the circuit?

• 3A

• 4A

• 6A

• 12A

What is the unit of electrical resistance?

• Ampere

• Volt

• Ohm

• Watt