Practice quiz 4

An appliance draws 0.3 A of current when connected to a 120-volt circuit. Calculate its resistance.

• 100 Ohm

• 200 Ohm

• 300 Ohm

• 400 Ohm

If a Grill produces 15 ohms of resistance in a 120-volt circuit, what is the amount of current in the circuit?

• 8 A

• 1.8 A

• 1800 A

• 15 A

What happens to the current in a circuit if a 20Ω resistor is removed and replaced by a 40Ω resistor?

• No effect will happen.

• The current will increase to half of its previous value.

• The current will decrease to half of its previous value

• The current will decrease to 1/3 of its previous value.

Which of the following formulae is correct when it related to series circuits?

• VT=V1=V2=V3

• VT=V1+V2+V3

• IT=I1+I2+I3

• 1/RT=1/R1+1/R2+1/R3

Find the value of the total current in the shown circuit.

• 0.5 mA

• 0.5 A

• 162 mA

• 162 A

Find the value of the total current in the shown circuit:

• 14.4 A

• 14.4 mA

• 0.692 A

• 0.692 mA

Find the voltage drop across the (20 Ohm ) resistor.

• 0.225 V

• 4.444 V

• 6.67 V

• 8.89 V

AC waveform has a period of T= 40 ms, what is the frequency?

• 50 Hz

• 25 Hz

• 0.025 Hz

• 60 Hz

What is the amplitude of an AC waveform that has an instantaneous value of 300 V and an angle of 90

• 100 V

• 200 V

• 300 V

• 500 V

What is the peak value of an AC waveform that has an average voltage of 139.92 V

• 220 V

• 120 V

• 300 V

• 500 V