Current electricity

Current electricity

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Multiple Choice

Resistance is measured in what unit?

• ohms
• amps
• watts
• volts

Multiple Choice

Potential difference is another term for

• current
• voltage
• energy
• watts

Multiple Choice

Unit of charge in SI unit is.....

• Coulomb C

• Resistivity ρ

• Ampere A

• Potential difference V

Multiple Choice

What does this instrument measure? How should it be connected in a circuit?

• This instrument measures current. It should be connected in parallel.

• This instrument measures current. It should be connected in series.

• This instrument measures potential difference. It should be connected in parallel.

• This instrument measures electromotive force. It should be connected in series.

Multiple Choice

The instrument used for measuring electric current is

• galvanometer

• ammeter

• voltmeter

• potentiometer

Multiple Choice

In which mode cells are connected in the circuit?

• series

• parallel

Multiple Choice

When a conductor is stretched , its length becomes double .Find out how many times the resistance changes.

$$R\ =\ \rho\ \frac{L}{A}$$   L - length , A - area of cross section

• remains same

• 4 times

• 2 times

• 10 times

Multiple Choice

Arrangement used to reduce the resistance in a circuit

• Resistors connected in alternate

• Resistors connected in series

• Resistors connected in parallel

• Resistors connected in combination

Multiple Choice

Those substances which have very low resistance are called as.....

• Conductors

• Insulators

• Ametre

• Voltmetre

Multiple Choice

As more resistors are added in series to a constant voltage source, the power supplied by the source

• increases.

• decreases.

• does not change.

• increases for a time and then starts to decrease.

Multiple Select

A 9-V battery is hooked up to two resistors in series using wires of negligible resistance. One has a resistance of 5 Ω, and the other has a resistance of 10 Ω. Several locations along the circuit are marked with letters, as shown in the figure. Which statements about this circuit are true? (There could be more than one correct choice.)

• The current is exactly the same at points A, B, C, and D.

• The current at A is greater than the current at B, which is equal to the current at C, which is greater than the current at D.

• The current at A is greater than the current at B, which is greater than the current at C, which is greater than the current at D.

• The potential at D is equal to the potential at C.

Multiple Choice

Four unequal resistors are connected in series with each other. Which one of the following statements is correct about this combination?

• The equivalent resistance is equal to that of any one of the resistors.

• The equivalent resistance is equal to average of the four resistances.

• The equivalent resistance is less than that of the smallest resistor.

• The equivalent resistance is more than the largest resistance.

Multiple Choice

What is the voltage of a circuit with 4 ohms of resistance and 3 amps of current?

• 12 V

• 21 V

• 4/3 V

• 3/4 V

Multiple Choice

This circuit has a 24 volt battery and the resistor is 8 ohms. How many amps are running through the circuit?

• 3 Amps

• 192 Amps

• 2 Amps

• 4 Amps

Multiple Choice

How many Volts would we need to produce a current flow of 8 Amps through a 6 Ohm resistor

• 12 volts
• 24 volts
• 1.3333
• 48 volts

Multiple Choice

If the Voltage stays the same and Resistance is increased, Current will 

• Increase
• Decrease
• Stay the same
• X

Multiple Choice

If the Voltage is increased and the resistance stays the same, Current will

• Increase
• Decrease
• Stay the same
• X

Multiple Choice

Current times Resistance equals
 (I X R)

• Power
• Voltage
• Amperage
• Ohm

Multiple Choice

Voltage divided by Resistance

(V / R)

• Current

• Power

• Ohms

• Watts

Multiple Choice

What is current measured in?

• Ω (Ohms)

• V (Volts)

• A (Amps)

• W (Watts)

Multiple Choice

What size resistor would produce a 3 Amp current flow with a 12 Volt battery

• 1 Ohm
• 3 Ohms
• 4 Ohms
• 12 Ohms