• Power (P): It's the rate at which energy is converted or used.
  • P (dissipated in a component) = I (current through it) × V (potential difference across it).
• Energy (E): Converted in time Δt is given by E = IVΔt.
• Ohm's Law = V = IR.
  • This relates the potential difference (V), current (I), and resistance (R) of a component.
• Two other 🔥 hot equations
  • P = I²R
  • P = V²/R
• If you're unsure about either V or I
  • E = I²RΔt
  • E = V²/RΔt

Real-world Application: When you plug in your electric kettle to boil water, these equations are at play, determining how much power it draws and how long it takes!

• Mystery of the Battery's Strength!
  • You've got a 150Ω resistor. In 60 seconds, it's feeling HOT, dissipating 32J of thermal energy. How strong is that battery it's connected to? 🤔
• Warm Toes & Science! 🦶
  • Imagine underfloor heating (no more cold mornings!). With a wire that's transferring a warm 800W when 3.5A of current flows - a. What’s the resistance of this cozy wire? b. What's the potential difference making your toes toasty? c. The wire's 48m long and made of a special metal. Can you guess its thickness?

• Bring the Heat! ☀️
  • You’ve got a radiant heater. Pops out 1200W on a 230V connection. But what if you plug it into a 110V socket?
• Halving the Heat! ✂️
  • A wire's chilling, converting 200W energy. Cut it in half. The shorter wire: what's it converting now?
• Double Trouble: Circuit Edition! ⚡
  • Circuit 1: Two twin resistors, just chilling side-by-side in parallel.
  • Circuit 2: Those same resistors, but now in a series!

Real-world Application: Ever wondered why sometimes your gadgets heat up? Well, they have resistors inside doing some heavy lifting!