The critical temperature for superconductors is the temperature at which the electrical resistivity of a metal drops to zero.

A varistor remains non-conductive as a shunt-mode device during normal operation when the voltage across it remains well below its clamping voltage, thus varistors are typically used for suppressing line voltage surges.

An instrument or a circuit consisting of four resistors or their equivalent in series, used to determine the value of an unknown resistance when the other three resistances are known.

A ratio of increased conductor resistance per degree celsius rise in temperature. Most metals increase in resistance as temperature increases, giving them a positive temperature coefficient.

NTC thermistors are the usual type. This means that as the temperature of the environment rises, the resistance of the thermistor drops.

LDR be variable resistor because its resistance varies with intensity of light

A fuse wire should have a low melting point and should be connected in series with the appliance, also it should have a comparatively high resistance.

The ratio of V/I is constant and when current is plotted as a function of voltage the curve is linear (a straight line).

Circuit breaker breaks the circuit when it senses any abnormal condition in the circuit using relay. Relay is a very important component in a circuit breaker.

An anode is positively charged.

If one of the parallel resistors shorted out, then the voltage across all of them would be zero (short) volts. Since,  the voltage across the other resistors is zero, the current would also be zero.

According to resistor color code RED is 2 orange 3 and third orange 10 to the power of that value so 10000 so R= 23000 I= V/R= 40/23000= 1.74 mA.

According to ohms law, V= IR. Where V= IRV = 34*2.V = 68 Volts.

I= 750mA, I= 750*10^3A, V= 150V,R= V/I; R= 150/(750*10^3); R= 200 ohm.

V = IR. R = V/I R = 4.5/30 *10^-3  R = 150 Ohm.