Electric Circuits Answers

when using DC equipment such as tablets, games consoles and mobile phones, discuss the principles behind ‘charging them up’ from the AC mains supply.

how do fuses and miniature circuit breakers (MCB’s) work in domestic appliances and why are they necessary?

kettles and hairdryers are often ‘double insulated”, what is the significance of this?

A transformer has a primary coil of 5200turns. When the output p.d is 12Vr.m.s, the input
p.d is 240Vr.m.s. (a) How many turns are there on the secondary coil? (b) The output
from the secondary coil is connected across a 20Ω lamp. (i)What is the r.m.s current in
the secondary coil? (ii) What is the r.m.s current in the primary coil?
(

The r.m.s value of an alternating voltage is 14V. What is the value of the peak voltage?

Explain, using diagrams, how Fleming’s Left Hand Rule (FLH) applies to electric motors and how Fleming’s Right Hand Rule (FRH) applies to AC generators

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R=4

Draw the circuit representing a practical transmission line in terms of lumped components. What are the values of R and G in case of ideal transmission line? Why?

Calculate the quantity of charge across a conductor if 20 amperes current flows through the conductor in 2 minutes

A +6.0 mC charge is moved from point A to point B (5.0cm) in a region of space with a uniform electric field of 15 000 N C−1 as shown in the figure above.

What is the change in electrical potential energy of the charge? (to 2 s.f.)