Electric Circuits Answers

two Identical resistors are connected in parallel across a battery their combined resistance is 12 ohms what is the resistance of each resistor

The battery powers 4 motors in the drone. 

Each motor has a resistance of 1.60 Ω when the power input to each motor is 19.6 W 

The 4 motors are connected in parallel with the battery. 

Calculate the current through the battery. 

Rh=1/resistivity

Why hall coefficient is equal to 1/restivity why this relation come from

what is the relation between resistivity and hall coefficient may I get the relation with proof

What is required to make a complete electric circuit?

Find the amount of charge passing per second through a wire carrying 10 A of current.

3. a. Briefly explain Ohm’s Law (2 marks)

b. A 750 Watt electric convector heater is plugged into a 240 Volt power supply. A trolley

passing over the flex from the heater to the plug has caused the insulation to distort

and has reduced the resistance between the live and neutral wires to 60 Ohms.

(i) What is the rate of heat production (in Watts) at the point where the cable is

damaged? (Please show your calculations.) (1 mark)

(ii) The plug fitted to the heater flex carries a l3 amp fuse, is this the correct rating

for the appliance? (2 marks)

(iii) Would the correctly rated fuse have 'blown' as a result of the fault? (Please

show your calculations.) (1 mark)

b. Several years ago a change in the recognised colour conventions led to phase (live)

cables in industrial three phase power installations being changed from red, yellow

and blue to black, grey and brown. What are the implications for premises that have

not been rewired since that time? (4 marks)

c. Electric lighting is often overlooked as a potential source of ignition. List factors that

might lead to an electric light fitting becoming a source of ignition. (5 marks)

d. List the problems associated with the use of electric adaptors in the workplace and

why their use should be minimised. (5 marks

Rh=1/resistivity

what is the relation between resistivity and hall coefficient may I get the relation with proof