電 — Electricity, Lightning, Electronic

Meaning

The kanji 電 (den) is a fundamental character in Japanese, primarily conveying the meaning of “electricity,” “electric,” or “lightning.” Its significance is rooted in observing natural phenomena, specifically the dramatic interplay of rain and lightning. This character beautifully exemplifies a phono-semantic compound, skillfully combining elements that hint at both its meaning and pronunciation.

Tracing its etymology back to ancient pictographs, the upper component, 雨 (ame), clearly depicts “rain.” Below it, the component 申 (shin/mōsu) originally represented a lightning bolt or a sudden flash. In its earlier forms, 申 was also associated with extending or stretching, much like how lightning streaks across the sky. The combination of these two elements—rain and a lightning flash—perfectly encapsulates electrical phenomena as understood in antiquity. The visual shape directly illustrates lightning striking during a rainstorm, which was the most common and powerful manifestation of electricity known to early civilizations. When you see 電, you can almost visualize a stormy sky with rain pouring down and lightning illuminating the scene.

This kanji has 13 strokes and is taught in the second grade of elementary school in Japan. Its frequent appearance in modern Japanese vocabulary makes it an essential part of the JLPT N5 curriculum.

Readings

On'yomi (音読み) — Chinese-derived readings

The primary and most common reading for 電 is デン (den). This on'yomi reading is almost exclusively used when 電 forms part of a compound word, especially those related to modern concepts of electricity, electronics, and telecommunications. It is rare to find 電 used as a standalone word with this reading.

電車でんしゃ (densha) — This compound combines 電 (electricity) with 車 (car/vehicle) to mean “electric train.” It's one of the most common terms you'll encounter daily in Japan, referring to the primary mode of public transportation.
電話でんわ (denwa) — Combining 電 (electricity) with 話 (talk/speak), this word means “telephone.” It highlights how electricity enables long-distance communication, a revolutionary concept when the term was coined.
電気でんき (denki) — This versatile word uses 電 (electricity) and 気 (spirit/energy) and can mean “electricity,” “electric light,” or “electric power.” It is a broad term encompassing the general concept of electrical energy and its applications.
電池でんち (denchi) — Meaning “battery,” this word pairs 電 (electricity) with 池 (pond/pool), perhaps metaphorically referring to a container or 'pool' of electric energy.

Kun'yomi (訓読み) — Native Japanese readings

The kanji 電 (den) does not have any commonly used kun'yomi readings as a standalone character. Its meaning is almost exclusively expressed through its on'yomi reading in compound words. This often happens with kanji introduced to Japan specifically to represent new, technical concepts that lacked direct native Japanese equivalents, or for characters whose native readings have simply fallen out of common usage.

Common Words & Compounds

The kanji 電 appears in numerous compound words, highlighting the widespread integration of electricity and electronic technology in modern life. These compounds can be categorized by their theme, showcasing the diverse applications of this single character.

Electrical Devices and Appliances

電子でんし (denshi) — electron, electronic. This is the root for many electronic terms, like 電子レンジでんしレンジ (denshi renji - microwave oven).
電球でんきゅう (denkyū) — light bulb.
電化製品でんかせいひん (denka seihin) — electric appliances. A common term for household electronics.
電動でんどう (dendō) — electric-powered (e.g., 電動歯ブラシでんどうハブラシ - electric toothbrush).
家電かでん (kaden) — home electronics/appliances (short for 家庭用電気製品かていようでんきせいひん).

Electricity and Power Concepts

電力でんりょく (denryoku) — electric power.
電圧でんあつ (den'atsu) — voltage.
電流でんりゅう (denryū) — electric current.
発電所はつでんしょ (hatsudensho) — power plant.
停電ていでん (teiden) — power outage, blackout.
送電そうでん (sōden) — transmission of electricity.

Telecommunications and Information

電報でんぽう (denpō) — telegram. While less common now, it's a classic example.
電波でんぱ (denpa) — radio wave, electromagnetic wave.
充電じゅうでん (jūden) — charge (a battery).
電卓でんたく (dentaku) — electronic calculator.

Other

電光でんこう (denkō) — lightning flash, electric light. Often used in phrases like 電光石火でんこうせっか (denkōsekka - lightning speed).
電撃でんげき (dengeki) — electric shock; (figuratively) a sudden attack.

Example Sentences

電車でんしゃで駅えきまで行いきます。

densha de eki made ikimasu.

I will go to the station by train.

電気でんきを消けしてください。

denki o keshite kudasai.

Please turn off the light.

携帯電話けいたいでんわで話はなします。

keitaidenwa de hanashimasu.

I will talk on my mobile phone.

この部屋へやにはまだ電気でんきが来きていません。

kono heya ni wa mada denki ga kiteimasen.

Electricity has not yet reached this room.

雷かみなりが鳴なって、電気でんきが止とまりました。

kaminari ga natte, denki ga tomarimashita.

Thunder rumbled, and the electricity stopped.

電池でんちが切きれそうなので、充電じゅうでんしなければなりません。

denchi ga kiresō nano de, jūden shinakereba narimasen.

The battery is about to run out, so I must charge it.

あの電子でんしレンジはとても便利べんりです。

ano denshi renji wa totemo benri desu.

That microwave oven is very convenient.

電波でんぱが悪わるくて、電話でんわが切きれてしまいました。

denpa ga warukute, denwa ga kirete shimaimashita.

The signal was bad, and the phone call was cut off.

Related Kanji

Memory Tip

To remember 電, visualize a stormy scene: The top part, 雨 (rain), clearly shows rain falling from the sky. Below it, imagine a zigzagging bolt of lightning, representing 申, striking the ground. This powerful flash of light during a rainstorm perfectly captures the essence of "electricity" or "lightning." So, think of "rain (雨) + lightning (申) = electricity (電)." The ancient Chinese viewed lightning as a powerful, almost divine, extension (申) from the heavens during rain (雨), which ultimately led to this character representing such a formidable natural force.