Science Bodmas

Open Ended

Why is it important to understand standard units of measurement and mathematical principles in electrical installation and design work?

Multiple Choice

Which mathematical operation should be performed first in the expression 2 + 4 x 4 – 1?

• Addition

• Multiplication

• Subtraction

• Division

Open Ended

Explain the steps involved in solving the expression 4(3 + 2 x 2) as shown in Example 2.

Multiple Choice

What is the value of h in the equation h = √(3² + 4²)?

• 3

• 4

• 5

• 7

Multiple Select

Which of the following are SI units used to standardise systems of measurement in UK/Europe?

• Amps

• Volts

• Ohms

• Joules

Open Ended

Match the following base quantities to their correct base units and symbols as shown in the table: Length, Mass, Time, Electric current, Temperature.

Multiple Choice

Which of the following is the correct unit symbol for resistance?

• Ω

• A

• V

• W

Multiple Select

Which of the following are correct multiples for the unit of power (Watt)?

• Kilowatt (kW)

• Megawatt (MW)

• Milliwatt (mW)

• Microamp (μA)

Open Ended

Explain why it is important to use the correct base units when performing calculations in electrical engineering.

Multiple Choice

If you have a value of 400 kilovolts, how would you express this value using indices?

• 4 × 10^2 V

• 4 × 10^3 V

• 4 × 10^4 V

• 4 × 10^5 V

Open Ended

What do you notice when you enter 0.003 into your scientific calculator, press '=', then press 'ENG' and 'SHIFT ENG' several times?

Multiple Choice

Which of the following is NOT a correct step when transposing formulae involving multiplication and division?

• The value to be determined must be on the top line.

• The value to be found must be on its own on one side of the equals sign.

• Any value moved over the equals sign moves from bottom to top or top to bottom.

• The value to be determined must always be on the bottom line.

Multiple Select

Which of the following statements are true when transposing formulae involving multiplication/division?

• The value to be determined must be on the top line.

• Any value moved over the equals sign moves from bottom to top or top to bottom.

• The value to be found must be on its own on one side of the equals sign.

• The value to be determined must always be negative.

Multiple Choice

Given the formula R = ρl/A, what is the correct rearrangement to make A the subject of the formula?

• A = ρl/R

• A = R/ρl

• A = ρl × R

• A = R/ρ

Multiple Choice

If a + b - c = d, what is the value of c?

• c = a + b - d

• c = a + b + d

• c = d - a - b

• c = a - b + d

Multiple Choice

If a + b = c + d, how would you transpose the formula to make c the subject?

• c = a + b - d

• c = a - b + d

• c = a + b + d

• c = d - a - b

Open Ended

Explain the process of transposing a formula to make a variable the subject, using the examples from the slides.

Multiple Choice

Which of the following steps are necessary when transposing formulae involving more complex scenarios?

• Convert the action to the opposite on the other side of the equals sign

• Keep the action the same on both sides

• Only move constants, not variables

• Ignore the sign when moving terms

Multiple Choice

Given h = √(a² + b²), what is the value of b?

• b = √(h² - a²)

• b = h² + a²

• b = h + a

• b = √(a² - h²)

Open Ended

What does BODMAS stand for?

Open Ended

How do standard units of measurement and mathematical principles contribute to electrical installation, maintenance, and design work?