WJEC GCSE Electronics switching circuits quiz quiz

Half-on and half-off

Saturated (fully on) and cut-off (fully off)

Forward and reverse

Charging and discharging

a small base current

a gate voltage only

the supply frequency

the collector resistance

Gate, drain, source

Anode, cathode, gate

Base, collector, emitter

Input, output, ground

To increase the supply voltage

To store charge

To convert AC to DC

To limit the base current to a safe value

a gate voltage above its threshold

a large gate current

reversing the supply

cooling it down

Base, collector, emitter

Gate, drain, source

Anode, cathode, body

Positive, negative, neutral

It needs a large current

It works only with AC

Its gate draws almost no current (high input resistance)

It has no threshold voltage

Stores a voltage for later

Adds two voltages together

Smooths a rectified voltage

Compares two input voltages and switches its output high or low

the non-inverting (+) input is higher than the inverting (-) input

both inputs are zero

the supply is switched off

the inputs are equal

The colour of the LDR

The reference voltage from a potential divider

The length of the wires

The room temperature only

The comparator output cannot supply enough current for the lamp

The lamp produces too much light

The comparator runs on AC

To make the lamp dimmer

needs no current to operate

amplifies the sensor signal

gives electrical isolation between the control circuit and the load

removes the need for a power supply

To make the relay switch faster

To increase the coil voltage

To change AC to DC

To absorb the voltage spike when the coil is switched off

Its colour

The maximum collector current and the turn-on requirement

The manufacturer's logo

The packaging weight