Electronics - Thyristor and Capacitor

Which of the following shows a symbol of a thyristor?

• 
• 
• 

Thyristors are widely used in ________ systems.

• aircon

• alarm

• alarm clock

When switch S1 is pressed, current flows into the gate of the thyristor and

• switches it off.

• switches it on. Bulb remains off.

• switches it on. Bulb lights up and remains lit even when switch S1 is released.

• switches it off. Bulb then lights up.

Thyristors can be reset by

• switching off and then switching on the circuit after a while.

• switching off the circuit.

• removing the thyristor

Capacitors store ____________ .

• voltage

• current

• charges

• money

The S.I unit for capacitance is ___________.

• Farats.

• Carats.

• Farads

• Fats.

True or False. Electrolytic capacitors must be connected to the correct terminals to work.

• True.

• False.

The figure shows the circuit symbol of a _____________ capacitor.

• non-electrolytic

• electrolytic

Study the circuit and state under which condition the bulb will light up?

• Dark

• Warm

• Bright

Study the circuit and name the input and output components.

• Input: Resistor Output: Motor

• Input: Thermometer Output: Buzzer

• Input: Transistor Output: Bulb

• Input: Thermistor Output: Buzzer