Resistors and capacitors

A capacitors has a charge of 5 x 10^-4 C when the potential difference across its Plates is 300v. Find the capacitance of the capacitor. Note: Use the formula C = Q / V

• 1.67 x10^-6 mF

• 1.67 x10^-4 QF

• 1.67 x10^-3 mF

• 1.67 x10^-9 nF

A 20 x 10^-6 micro farad capacitor is connected to a source of potential difference of 150v. What is the resulting charge of the capacitor? Find Q. ? note. use the formula C = Q/V

• 3 x 10 ^-5 Coulomb

• 3 x 10^-6 Coulomb

• 3 X 10 ^-3 Coulomb

• 3 x 10 ^-4 coulomb

What is the potential difference between plates of a 30 micro farad capacitor whose charge is 50 micro coulomb. Find Voltage in volts? Note. Use the formula: C = Q/V

• 176 volts

• 17.6 volts

• 1.76 volts

• 1.67 volts

A parallel plate capacitor has plates of 5 cm² and 0.1mm apart. Find its Capacitance in air or using K=1 Use the formula: C = K Eo ^A _/d Where: c- is the capacitance in farad

Eo - electrostatic constant ( 8.85 x 10^-12 F/m)
A- area of the plate in meter²
d - distance between plates meter

note: K _⁼ air is (1 )

• 22.1 x 10^-12 farad

• 2.21 x 10 ^-10 farad

• 221 x 10 ^-9 farad

• none of the above

How much Energy in joules is being stored in a 50 pF capacitor. When it is charged with to a potential difference of 200 volts. Use the formula U = 1/2 CV²

^{Note: 50 pf is written as ;} 50 X 10 ^-12 farad
unit is in - joules

• 1 x 10^-3

• 1 x 10^-9

• 1 x 10^-12

• 1 x 10^-6

The resistor has 4 bands. Red, Green, Blue, Gold Which answer is correct?

• 25K ohms with 5% tolerance

• 25M ohms with 5 percent tolerance

• 6.5 k ohms with 5 % tolerance

• 2500 ohms with 10% tolerance

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  The electrical component that is designed to resist the flow of the current?

• resistors

• insulators

• conductors

• all of the above

A resistors first three colors are brown, black and red. What is its value

• 10 ohms

• 100 ohms

• 10k ohms

• 1 k ohms

Which digit on the 1st band does the color yellow denote on a resistor color band

• 2

• 3

• 4

• 7

A 47 k ohm resistor would have which color on its first three bands

• yellow, violet, white

• red,white,blue

• yellow, violet ,orange

• orange, yellow , violet