Linear Equations
Where linear equations show up in real life
8 live exhibits. Each one already works. Change a number and see what happens.
Open as board Play with these together. Solving one grows related exhibits.
Start hereOhm’s law: how much current flows?
Push harder (volts) or squeeze tighter (ohms), and watch the current change.
Systems of EquationsPhone plans: finding the break-even point
Two plans, two lines. Where they cross, the price is the same.
Linear EquationsSpeed, distance, time: how long is the drive?
Distance is speed times time. Rearrange it and you know when you’ll arrive.
Linear EquationsHow many amps does it draw?
Watts divided by volts gives amps. That decides the breaker and the wire.
Linear EquationsHourly pay and overtime: time-and-a-half
A straight line with a bend: after 40 hours, every hour pays more.
Linear EquationsRoof pitch and ramp slope: rise over run
Slope is one number that decides whether a roof sheds water or a ramp is safe to roll up.
Linear EquationsVoltage drop: what the wire takes before the load gets it
Current times wire resistance is voltage you never get to use.
Linear EquationsVoltage divider: two resistors make a new voltage
The output is the input times a ratio of resistors, until you connect a load.
Formula families
- Ohm’s Law & Electrical PowerTwelve formulas, one wheel. Know any two and find the other two.
- Speed, Distance & TimeCover the one you want; the other two show you how to get it.