science

T-money

T-money is a science topic covered in the lgStudy science library. This page brings together a partial reference excerpt, illustrations, worked examples, real-world applications and a short study plan, so you can understand T-money rather than just read about it. In short: T-money (Korean: 티머니) is a rechargeable series of smart cards and other "smart" devices used for paying transportation fares in South Korea. T-money can also be used in lieu of cash or credit cards in some convenience stores and other businesses.

Key takeaways

T-money belongs to science; place it in that map before memorising details.
Learn the definition first, then one example that makes the definition concrete.
Connect T-money to a quantity you can measure, compute or draw — that is where exam questions come from.
Reproduce the core statement of T-money from memory before moving on to harder problems.

Reference excerpt

T-money (Korean: 티머니) is a rechargeable series of smart cards and other "smart" devices used for paying transportation fares in South Korea. T-money can also be used in lieu of cash or credit cards in some convenience stores and other businesses. The T-money System has been implemented and is being operated by T-money Co., Ltd of which 34.4% owned by Seoul Metropolitan Government, 31.85% owned by LG CNS, and 15.73% owned by Credit Card Union.

Usage Similar to its predecessor, the "Seoul Bus Card", T-money can be used to pay for bus, subway and some taxi fares. As of June 2024, T-money is accepted by:

All public transport buses nationwide All six Metropolitan Subway networks (Seoul, Incheon, Busan, Daegu, Daejeon, and Gwangju) AREX, U Line, EverLine, Shinbundang Line, Donghae Line (Metro) and Busan–Gimhae Light Rail Transit Korail ticket offices Toll booths operated by Korea Expressway Corporation Additionally, shops and attractions including Seoul's four palaces (except Gyeonghuigung), Lotte World amusement park, Kyobo Book Centre, GS 25, CU/FamilyMart and other selected convenience stores accept T-money as payment method.

Card types

Standard T-money cards cost 3,000 - 5,000 Won and can be purchased and recharged at metro stations, bank ATMs, convenience stores and kiosks located adjacent to bus stops. Self-service recharge machines are also available at Seoul and Busan metro stations. In 2014, "One Card All Pass"-enabled T-money was introduced. It holds "One Card All Pass" logo, and bears slightly different card number system compared to generic T-money. As of March 2016, "One Card All Pass" T-money is accepted at major retailers, most express bus and some intercity bus routes, express road toll booths, Korail stations, all metro systems, and all bus systems except Gimhae.

Discount cards There are two types of discount cards available for sale, one for teenagers (age 13-18) and the other for children (age 7-12). One needs a proper ID such as a Youth Card or Student ID in order to purchase these cards. Discount cards must be registered via the Internet within 10 days after first use. Registration requires the number on the card, and a National ID number or Foreigner Registration Number. Senior citizens are entitled to free transportation and can pick up free tickets at ticket machine in Seoul metropolitan subway stations with proper ID.

T-money accessories Smaller, more durable T-money cards with a lanyard for easy attachment to cell phones are also available, for about 6,000~8,000 won.

Related cards Metro Pass (정기권), a monthly pass for the Seoul and Incheon subway systems available at stations. T-money Mpass, a one-day transportation card incorporating the Seoul City Tour Bus ticket and limited use of the metropolitan transportation system. Seoul Citypass Plus is a T-money with extra benefits at tourist spots. Mobile T-money is a RF-/NFC-Subscriber Identity Module based T-money service. Mobile T-money application is available on Google Play and each mobile service provider's ESD.

Other cards eB Card (eBest Card, used in Gyeonggi & Incheon province), now discontinued. → See cashBee. Sensepass T-money, previously Topcash T-money, sold in the Gyeongsangnam and Gyeongsangbuk Provinces except Andong. Not wholly compatible with Smart T-money. Hankkumi card, sold in Daejeon. This is a rebranded version of Smart T-money. POP card, sold in GS25. This is a rebranded Smart T-money with GS&Point and Happy Point loyalty card. Narasarang Card, issued by Shinhan Card·Shinhan Bank and NMD/MMA. This is a K-Cash enabled debit card with POP card functionality. This card is only issued to ROTC officers and ROK Armed Forces enlisted person including KATUSA.

Illustrations

Worked examples

Example 1 — a first encounter with T-money

Start with the simplest possible case. Write down what T-money claims or describes in one sentence, then invent the smallest concrete situation in which that sentence is true. In science, the smallest case is usually a single object, a single equation or a single measurement. Check that every symbol or term in your sentence has a meaning in that case.

Example 2 — changing one variable

Take the situation from Example 1 and change exactly one quantity: double it, halve it, or set it to zero. Predict what should happen to T-money before you calculate. Comparing your prediction with the result is the fastest way to find out whether you understand the idea or only the words.

Example 3 — an exam-style question

Typical questions about T-money ask you to (a) state it precisely, (b) apply it to given data, and (c) explain a limitation. Practise writing all three answers in under five minutes; the third part is what separates a full-mark answer from an average one.

Applications of T-money

In research: T-money appears in science research whenever the underlying quantities have to be modelled precisely. Papers usually cite it as a starting assumption and then explore where it breaks down.
In technology and industry: Engineering practice reuses T-money in design rules, simulations and safety margins. Knowing the idea lets you read a specification sheet and understand why the numbers look the way they do.
In the classroom: T-money is common in secondary-school and first-year university syllabi. It links to neighbouring topics 2004 establishments in South Korea, 2004 introductions, Contactless smart cards, so understanding it makes those chapters shorter.
In everyday life: Look for T-money outside the textbook — in sport, cooking, traffic, electronics or the sky above you. An example you found yourself is remembered far longer than one you were given.

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How to study T-money in 20 minutes

Read the reference excerpt below once, without taking notes.
Close the page and write down what T-money means in your own words.
Compare your version with the excerpt and mark what you missed.
Work through the three examples above with pen and paper.
Explain T-money out loud to somebody else — or to Teacher Smith in the lgStudy chat.

Frequently asked questions

What is T-money in simple terms?

Why does T-money matter?

Because it connects several science ideas at once: it gives you a definition you can apply, a quantity you can calculate, and a way to check whether a result is plausible.

How should I study T-money?

Read the excerpt, restate it from memory, then work through the examples and applications listed on this page. The five-step study plan above takes about twenty minutes.

What does this page cover?

It gives you a compact reference excerpt plus original lgStudy explanations, examples, applications and study material on T-money.