gradually rises from 0 to 9V immediately drops from 9V to 0V

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Presentation transcript:

gradually rises from 0 to 9V immediately drops from 9V to 0V In the circuit shown, the switch is open and capacitor uncharged. When the switch is closed the voltage across the capacitor 9V S R C remains at 0V gradually rises from 0 to 9V immediately drops from 9V to 0V gradually drops from 9V to 0V remains at 9V

Identify the circuit symbol shown AND gate OR gate NOT gate diode LED

Which of the following electronic devices contains a counter circuit? Automatic parking light Digital stopwatch Electronic thermometer Intercom Radio receiver

A baby alarm needs an output device that transforms electrical energy into sound energy. Which of the following is suitable? Electric Motor LED Loudspeaker Relay Solenoid

Which of the following devices contains a counter circuit? Amplifier Intercom Burglar alarm Computer Radio receiver

The purpose of the amplifier in a personal stereo is to convert an analogue signal to a digital signal transform an electrical signal to a sound signal transform a sound signal to an electrical signal increase the frequency of an electrical signal increase the amplitude of an electrical signal

Which of the following is an output device? LDR LED Microphone Solar cell Thermistor

A telephone answering machine contains a loudspeaker, which is used in playing back any message received. The main energy transfer in the loudspeaker is electrical to sound sound to electrical chemical to sound sound to chemical electrical to chemical

Which of the following is an input device? Relay Buzzer Solenoid Loudspeaker Microphone

The symbol below is used to represent a component in an electronic circuit. What does it represent? A NOT gate An AND gate A LDR A LED An OR gate

Which of the following does not need a magnetic field to make it work? Relay Solenoid Electric Motor Electric Bell Amplifier

The following symbol is used in circuit diagrams The following symbol is used in circuit diagrams. The symbol represents a light emitting diode (LED) light dependent resistor (LDR) transistor variable resistor battery

A…