Electric Circuits Answers

Resistor consist of R1=4, R2= 4.5 R3= 12

Resistor R3 connected in parallel with R2 .

1 )draw a the circuit diagram

2 )calculate the voltage across R3 if the applied voltage is 12V .

3 ) calculate the current passing R1 and R 3

a coil with 50 turns and area 10cm2 is oriented with a plane perpendicular with a 0.75-T magnetic field. if the coil is rotated over(rotated through 180) in 0.20s. what is the average emf induced in it. 0.375v

When the direction of current is from negative to positive terminal of the battery then emf (E) is taken as

(a) positive

(b) negative

(c) zero

(d) normal?

Power

A charged oil-drop of radius 1.3×10-⁶ m is prevented from falling under gravity by the vertical field between two horizontal plates charged to a difference of of 8340V. The distance between the plates is 16 mm and the density of oil is 920 kgm-³. Calculate the magnitude of the charge on the drop.

[Take g = 10 ms-²]

When 10 cells of emf 10V are connected in parallel total emf is

An electric kettle is connected to a 120-V

outlet and has 11.5 A of current flowing

through it. What is the resistance in the

kettle?

An electromagnet exerts a force of 15 N and moves a soft iron armature through a distance of 12 mm in 50ms. Determine the power consumed

A current of 12 A flows in the element of an electric fire of resistance 25 Ω. Determine the power dissipated by the element. If the fire is on for five hours every day, calculate for a one-week period (a) the energy used, and (b) cost of using the fire if electricity cost ₱13.50 per kWh

A parallel circuit is set up With three resistors: 5 ohms 10 ohms and 15 ohms. If the power supply to the circuit is 30 V what is the current across each resistor and what is the total current through the circuit?