Parallel and Series Circuit Ohm's Law

The equivalent resistance for a group of parallel resistors is (điện trở tương đương trong đoạn mạch song song thì )

• Less than any resistor in the group.

• Equal to the smallest resistance in the group.

• Larger than any resistor in the group.

• Equal to the largest resistance in the group.

The three bulbs are identical and the two batteries are identical. Compare the brightnesses of the bulbs.

• A > B > C

• A > C > B

• A > B = C

• A < B = C

The potential difference across the 10 resistor is

• 30 V

• 20 V

• 15 V

• 2 V

What things about the resistors in this circuit are the same for all three?

• Current I

• Resistance R

• Potential difference

• Current I and resistance R

The battery current I is

• 3 A

• 2 A

• 1 A

• 2/3 A

The brightness of bulb A increases when the switch is closed or the switch is open?

• When the switch is closed

• When the switch is open

The battery current I is

• 3 A

• 2 A

• 1 A

• 2/3 A

What is the unit for potential difference?

• Ohm

• Volt

• Watt

• Ampere

What is the unit for current?

• Ampere

• Watt

• Volt

• Ohm

The following type of circuit has the same voltage throughout the entire circuit.

• series

• parallel