Forces and Energy - Forms of Energy (Heat, Light, Sound, Electrical)

Grade 5IB

Review the key concepts, formulae, and examples before starting your quiz.

🔑Concepts

•

^\circ C

•

c \approx 3 \times 10^8 \text{ m/s}

•

f

•

I

•

E_{electrical} \rightarrow E_{thermal}

📐Formulae

T(K) = T(^\circ C) + 273.15

v = f \cdot \lambda

I = \frac{Q}{t}

\text{Total Energy} = E_{useful} + E_{wasted}

💡Examples

Problem 1:

f

Solution:

v = 256 \text{ Hz} \times 1.34 \text{ m} = 343.04 \text{ m/s}

Explanation:

v = f \cdot \lambda

Problem 2:

25^\circ C

Solution:

T(K) = 25 + 273.15 = 298.15 \text{ K}

Explanation:

273.15

Problem 3:

12 \text{ Coulombs (C)}

Solution:

I = \frac{12 \text{ C}}{3 \text{ s}} = 4 \text{ A}

Explanation:

I = \frac{Q}{t}