📈 1. Energy vs Time GraphThis graph shows how total energy is used over time.
Key equation:E = P \times t
Explanation:X-axis → Time (seconds/minutes)
Y-axis → Energy (Joules)
The graph is a straight line increasing upward
Slope of the line = Power (P)
👉 Interpretation:
Steeper line → More energy used quickly (hard work)
Less steep → Lower energy use (light work)
📉 2. Useful Work vs Energy Input GraphThis graph compares total energy vs useful work.
Efficiency relation:\eta = \frac{W}{E_{in}}
Graph idea:X-axis → Energy input
Y-axis → Useful work
Straight line but slope < 1
👉 Interpretation:
If slope = 0.25 → 25% efficiency
The gap between input and work = energy loss
📊 3. Energy Distribution Graph (Pie Chart Concept)Total energy is divided into:
🟢 Useful work (20–30%)
🔴 Energy loss (70–80%)
👉 Visual idea:
Small portion = useful work
Large portion = heat + internal losses
📉 4. Power vs Time GraphFormula:P = \frac{W}{t}
Graph types:Constant work → horizontal line
Heavy work bursts → spikes
Rest periods → drops
👉 Interpretation:
High peaks = high energy consumption
Flat low line = resting or light activity
📉 5. Efficiency vs Workload GraphThis is very important in real life.
Shape:At low work → efficiency is low
At moderate work → efficiency increases
At extreme work → efficiency decreases
👉 Interpretation:
Best performance occurs at moderate workload
Overworking increases energy loss
📊 6. Heat Loss vs Activity LevelRelation:[
E_{loss} \propto \text{Activity level}
]
👉 Graph:
X-axis → Activity level
Y-axis → Heat loss
Curve increasing upward
👉 Meaning:
More activity → more heat → more energy loss
📉 7. Fatigue vs Energy GraphX-axis → Time
Y-axis → Energy level
👉 Shape:
Starts high
Gradually decreases
👉 Interpretation:
Energy decreases → fatigue increases
Rest resets the graph upward
🔥 8. Combined Graph Concept (Very Important)You can imagine 3 lines:
Total energy input (highest line)
Useful work (middle line)
Energy loss (difference between them)
Mathematically:
[
E_{loss} = E_{in} - W
]
👉 The vertical gap = energy loss
📌 Final Understanding from GraphsGraphs clearly show:
Energy increases with time
Useful work is always less than total energy
Loss is unavoidable and large
Efficiency depends on workload
Fatigue is directly related to energy depletion