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ROHM Resistor
ROHM Resistor
Basic knowledge: What is a Resistor?
You may already know these facts, but let us still explain resistors and their
principle of operation for those who may not know.
1. For example, resistors are In order to light up an LED (light emitting
used for lighting up LEDs diode), it is necessary to apply a voltage of
smoothly. about 2V across its two terminals. Therefore, the
voltage is not enough to light up the LED with
one single dry cell (about 1.5V) as shown in Fig.
1 (a). If, instead, two dry cells are connected
in series as shown in Fig. 1 (b), the voltage of
about 3V will be too much and excessive current
will flow through the LED thereby destroying the
LED. If a suitable resistor is placed between the
LED and the dry cells as shown in Fig. 1 (c), the
LED lights up with an appropriate brightness
without placing too much load either on the LED
or on the batteries. Thus, a resistor is one that
causes electric circuits to operate smoothly by
limiting the flow of current, and is an essential
component in any electric circuit.
(a) No light emission (b) Too much current flows (c) Ideal operating condition
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