Electromagnetism MCS 2

A 30 ohm resistor and a 60 ohm resistor are connected in series. Compared to the electric current through the 30 ohm, the electric current through the 60 ohm resistor is:

• smaller

• larger

• the same

• None of the above

In which circuit would current flow through resistor R1, but not through resistor R2 while the switch S is open? (K:1)

• 3

• 4

• 2

• 1

Which of the following regarding electromagnets is FALSE?

• To determine the magnetic field, compasses are used

• Conventional current flows from negative to positive

• Electromagnetism was discovered by Hans Oersted

• Magnetic fields can be induced around non-magnetic materials

According to the right hand rule as it applies to straight conductor, which of the following is false?

• Magnetic field is in the direction of your fingers

• Your thumb points from negative to positive charge

• Conventional current flows in the direction of your thumb

• Your thumb points from positive to negative charge

A 330-ohm resistor is connected to a 5.00 V battery. The current through the resistor is:

• 15.2 mA

• 335 mA

• 0.152 mA

• 1650 mA

Which of the following is TRUE regarding AC (alternating current) and DC (direct current)?

• Alternating current changes directions periodically

• All countries use the same frequency of 50 times for AC

• America primarily used AC in the early years

• Most electrical transmission and generation currently is DC

Two identical resistors connected in parallel have an equivalent resistance of 40 ohms. What is the resistance of each resistor?

• 20 ohm

• 160 ohm

• 40 ohm

• 80 ohm

What is the total resistance of the circuit segment shown in the diagram below?

• 3.0 ohm

• 9.0 ohm

• 1.0 ohm

• 27 ohm

Three identical lamps are connected in parallel with each other. If the resistance of each lamp is X ohms, what is the equivalent resistance of the parallel combination?

• X/3 ohm

• 3X ohm

• X ohm

• 3/X ohm

What is the reading on ammeter A?

• 3.0 A

• 1.3 A

• 0.75 A

• d. 1.5 A