Understanding Mechanical and Electrical Principles

What is the formula for Ohm's Law?

In an AC circuit, what does AC stand for?

• Alternating Current

• Active Current

• Amplified Current

• Average Current

Which of the following is a characteristic of DC circuits?

• Current changes direction periodically

• Current flows in one direction

• Voltage is always zero

• Power is always constant

What is the unit of electrical resistance?

• Ampere

• Volt

• Ohm

• Watt

What is the principle behind electromagnetic induction?

• A changing magnetic field induces an electric current

• A constant magnetic field induces an electric current

• A changing electric field induces a magnetic current

• A constant electric field induces a magnetic current

What is the mechanical advantage of a lever?

• The ratio of output force to input force

• The ratio of input force to output force

• The sum of input and output forces

• The difference between input and output forces

Which of the following is a form of energy transfer?

• Conduction

• Reflection

• Refraction

• Diffusion

In a series circuit, how is the total resistance calculated?

• The sum of the reciprocals of individual resistances

• The sum of individual resistances

• The product of individual resistances

• The difference between the largest and smallest resistance

What is the unit of power in electrical circuits?

• Joule

• Newton

• Watt

• Coulomb

What is the frequency of the mains electricity supply in Great Britain?

• 50 Hz

• 60 Hz

• 100 Hz

• 120 Hz