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All fields Software Mathematics Physics Chemistry Biology Engineering Astronomy Environmental Other Engineering Engineering groups

Explore STEM Content

Search the community's STEM library — free to study, yours to make your own.

Engineering

Circuits, mechanics, materials and design on openstem — flashcards, notes, quizzes, sketches and flowcharts shared by the community. Study free, or clone anything into your library.

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Note~227 words · 1 min

Two ways to fail in compression Buckling arrives at loads far below the crushing strength, and it arrives suddenly. Push a drinking straw end-on and you'll see it. Euler's critical load Length dominates, because it's squared Real ends aren'

Engineering

Engineering · L3 · Column Buckling

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Engineering · L3 · Column Buckling

Flashcards11 cards

What is the basic difference between AC and DC?1 / 11

DC (direct current) flows in one constant direction — its voltage and current don't change sign. AC (alternating current) periodically reverses direction, with its voltage swinging positive and negative in a repeating cycle, usually a sine wave.

Engineering

Engineering · L3 · AC Circuits — Concepts

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Engineering · L3 · AC Circuits — Concepts

Collection5 items

01Engineering · L3 · Op-Amps

02Engineering · L3 · Op-Amps — Gain Calculations

03Engineering · L3 · Op-Amps & Basic Amplification

+2 more

Engineering

Engineering · L3 · Op-Amps

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Engineering · L3 · Op-Amps

Flowchart13 objects

Engineering

Engineering · L2 · Choosing Materials for a Bike Helmet

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Engineering · L2 · Choosing Materials for a Bike Helmet

Flowchart11 objects

Engineering

Engineering · L1 · How a Steam Train Gets Its Push

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Engineering · L1 · How a Steam Train Gets Its Push

Collection5 items

01Engineering · L3 · Series Resistor Networks

02Engineering · L3 · Parallel Resistor Networks

03Engineering · L3 · Equivalent Resistance: Series & Parallel Networks

+2 more

Engineering

Engineering · L3 · Resistor Networks

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Engineering · L3 · Resistor Networks

Collection4 items

01Engineering · L1 · Wind & Sails

02Engineering · L1 · Wind & Sails

03Engineering · L1 · How a Sail Catches the Wind

+1 more

Engineering

Engineering · L1 · Wind & Sails

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Engineering · L1 · Wind & Sails

Flashcards9 cards

What tool do you use to measure how long something is?1 / 9

A ruler. It has marks that show inches or centimetres.

Engineering

Engineering · L1 · Tools & Safety

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Engineering · L1 · Tools & Safety

Flowchart14 objects

Engineering

Engineering · L3 · Ethics — Scenario Practice · flowchart

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Engineering · L3 · Ethics — Scenario Practice · flowchart

Quiz6 questions

What is a ramp (inclined plane) used for?

ATurning a straight-up lift into a push up a slopeBMaking objects heavierCCutting things in halfDMeasuring distance

Engineering

Engineering · L1 · Ramps & Wedges Quiz

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Engineering · L1 · Ramps & Wedges Quiz

Flashcards10 cards

What is Design for Manufacturing (DFM)?1 / 10

Designing a part so it is easy, fast, and cheap to actually manufacture — not just easy to draw on paper. DFM asks "how will this really get made?" at the design stage, before any tooling is cut.

Engineering

Engineering · L3 · Design for Manufacturing

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Engineering · L3 · Design for Manufacturing

Note~221 words · 1 min

Two resistors, one tap point Worked values What it's actually for The assumption that bites people The formula assumes almost no current leaves the tap.

Engineering

Engineering · L3 · Voltage Dividers

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Engineering · L3 · Voltage Dividers

Flowchart9 objects

Engineering

Engineering · L3 · Solving a Continuity Equation Problem

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Engineering · L3 · Solving a Continuity Equation Problem

Collection5 items

01Engineering · L3 · Transistors as Switches

02Engineering · L3 · Transistor Switching — Applications & Practice

03Engineering · L3 · Transistors as Switches

+2 more

Engineering

Engineering · L3 · Transistors

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Engineering · L3 · Transistors

Flowchart7 objects

Engineering

Engineering · L2 · Requirements Gathering Quiz · flowchart

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Engineering · L2 · Requirements Gathering Quiz · flowchart

Flowchart5 objects

Engineering

Engineering · L1 · Conductors and Insulators · flowchart

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Engineering · L1 · Conductors and Insulators · flowchart

Note~149 words · 1 min

A prototype is a first try It's a small, cheap, quick model built to test an idea before anyone spends real time and money on the finished thing. Testing a paper aeroplane is far easier than testing a real one. If it flies badly you fold an

Engineering

Engineering · L1 · Prototypes: Try Small Before You Try Big

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Engineering · L1 · Prototypes: Try Small Before You Try Big

Note~461 words · 2 min

Head is pressure, expressed as a height A pump raises a fluid's pressure, but pascals are hard to picture. Head restates that pressure as the height of fluid column it could support. A pump adding 98,000 Pa to water gives H = 98000 ÷ (1000

Engineering

Engineering · L3 · Pumps, Head, and Matching a Pump to a Job

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Engineering · L3 · Pumps, Head, and Matching a Pump to a Job

Quiz6 questions

What is the key feature of a destructive test?

AIt is always cheaper than a non-destructive testBIt damages or destroys the part being testedCIt can be run on every unit in a batchDIt only checks the outside of a part

Engineering

Engineering · L3 · Quality Control & Testing

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Engineering · L3 · Quality Control & Testing

Flowchart5 objects

Engineering

Engineering · L3 · Shear Stress · flowchart

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Engineering · L3 · Shear Stress · flowchart

Flowchart5 objects

Engineering

Engineering · L1 · What Are Materials? Quiz · flowchart

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Engineering · L1 · What Are Materials? Quiz · flowchart

Flashcards8 cards

A microcontroller output pin can only supply about 4 mA, but a small motor needs 150 mA to run. How does a transistor solve this?1 / 8

Wire the pin to the transistor's base (through a resistor). The small 4 mA base current switches the much larger 150 mA collector current, which powers the motor from a separate supply — the microcontroller pin never has to carry the motor's current itself.

Engineering

Engineering · L3 · Transistor Switching — Applications & Practice

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Engineering · L3 · Transistor Switching — Applications & Practice

Flowchart8 objects

Engineering

Engineering · L2 · How Heat Travels · flowchart

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Engineering · L2 · How Heat Travels · flowchart

Flashcards9 cards

Why is it easier to push a wagon on wheels than to drag the same wagon on its side?1 / 9

Wheels roll instead of scraping along the ground. Rolling has much less friction than sliding, so it takes far less push to move the same load.

Engineering

Engineering · L1 · Wheels & Axles

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Engineering · L1 · Wheels & Axles

Flowchart11 objects

Engineering

Engineering · L1 · Choosing the Right Tool

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Engineering · L1 · Choosing the Right Tool

Note~155 words · 1 min

Measure twice, cut once Engineers measure before they build so the parts fit together the way they planned. Two tools, two questions Why everyone needs the same units Two friends build a toy box. One measures the sides in centimetres with a

Engineering

Engineering · L1 · Measuring & Units

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Engineering · L1 · Measuring & Units

Flashcards10 cards

What does volumetric flow rate Q measure, and what's its formula?1 / 10

Q is the volume of fluid passing a cross-section per unit time:

Engineering

Engineering · L3 · Flow Rate

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Engineering · L3 · Flow Rate

Flowchart12 objects

Engineering

Engineering · L3 · Method of Joints — Solving Order

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Engineering · L3 · Method of Joints — Solving Order

Note~256 words · 1 min

A gear is a wheel with teeth Plain wheels are smooth and can slip against each other. A gear's teeth grip, so it never slips. That makes gears perfect for passing turning motion from one part of a machine to another. When the teeth of two g

Engineering

Engineering · L1 · How Gears Turn Each Other

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Engineering · L1 · How Gears Turn Each Other

Flowchart5 objects

Engineering

Engineering · L1 · Air Takes Up Space · flowchart

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Engineering · L1 · Air Takes Up Space · flowchart

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