Lesson 1 Unit 8 Electronic Principles

The magnetic saturation of a material is approximately 1.5T. Is the material:

• Iron

• Copper

• Steel

• Aluminium

Electricity is concerned with the movement of:

• Neutrons

• Molecules

• Atoms

• Electrons

Fleming’s left-hand rule is best described as:

• First finger current, second finger field, thumb, force – describing generators

• First finger field, second finger current, thumb force – describing motors

• First finger field, second finger current, thumb force – describing generators

• First finger force, second finger current, thumb field – describing motors

What is best described as a joules per second?

• Amps

• Coulombs

• Volts

• Watts

A power of 500W is dissipated in a resistor of 35Ω. What is the current and voltage?

• 3.78A and 132.29V

• 3.78A and 134.12V

• 3.76A and 132.29V

• 3.78A and 132.58V

The energy stored in an inductor is 250mJ and the current is 5A. What is the inductance of the coil?

• 35mH

• 30mH

• 25mH

• 20mH

Consider the following illustration. What is the value of I4?

Consider the following circuit. What is the value of R1?

• 20Ω

• 10Ω

• 15Ω

• 25Ω

Consider the following circuit. Calculate the current through the 10Ω resistor.

• 4.65A

• 3.34A

• 2.97A

• 3.87A

A 100uF capacitor is connected in series with a resistor of 25Ω across a DC supply voltage. What is the time constant of the circuit?

• 1.5ms

• 2.5ms

• 2ms

• 1ms