Which of the following measuring instruments operates based on the heating effect of electric current?

What is the colour of red rose under a blue light?

Calculate the value of electric field intensity due to a charge of 4μC if the force due to the charge is 8N

An accumulator is 90% efficient. If it gives out 2700J of energy while discharging, how much energy does it take in?

Two capacitors of 0.0003μF and 0.0006μF are connected in series, find their combined capacitance.