Internal Resistance Quiz

What is internal resistance?

• Resistance to the flow of electric current outside a battery or cell.

• The ability of a battery or cell to conduct electric current.

• Opposition to the flow of electric current within a battery or cell.

• The rate at which electric current flows within a battery or cell.

How is internal resistance measured?

• Using a wattmeter

• Using a voltmeter and an ammeter

• Using a multimeter

• Using a power supply

State the formula to calculate internal resistance.

• R = (V + V') / I

• R = (V - V') * I

• R = (V + V') * I

• R = (V - V') / I

What are the units of internal resistance?

• volts

• amperes

• ohms

• watts

Explain the concept of internal resistance in batteries.

• Internal resistance in batteries refers to the resistance encountered by the flow of electric current within the battery itself.

• Internal resistance in batteries refers to the resistance encountered by the flow of heat within the battery.

• Internal resistance in batteries refers to the resistance encountered by the flow of electric current outside the battery.

• Internal resistance in batteries refers to the resistance encountered by the flow of magnetic current within the battery.

What are the factors that affect the internal resistance of a circuit?

• Length and cross-sectional area of the wire

• Resistance and capacitance of the circuit

• Temperature and voltage of the circuit

• Frequency and inductance of the circuit

Describe the experimental setup to measure the internal resistance of a cell.

• Connect the cell in parallel with a known resistor and a voltmeter. Vary the resistance and measure the voltage across the resistor. Plot a graph of voltage against current. The slope of the graph represents the internal resistance of the cell.

• Connect the cell in series with a known resistor and a voltmeter. Vary the resistance and measure the voltage across the resistor. Plot a graph of voltage against current. The slope of the graph represents the internal resistance of the cell.

• Connect the cell in parallel with a known resistor and an ammeter. Vary the resistance and measure the current passing through the resistor. Plot a graph of current against voltage. The slope of the graph represents the internal resistance of the cell.

• Connect the cell in series with a known resistor and an ammeter. Vary the resistance and measure the current passing through the resistor. Plot a graph of current against voltage. The slope of the graph represents the internal resistance of the cell.

What is the significance of internal resistance in electrical circuits?

• Internal resistance in electrical circuits has no effect on current flow.

• Internal resistance in electrical circuits only affects AC circuits.

• Internal resistance in electrical circuits limits current flow and affects circuit performance.

• Internal resistance in electrical circuits increases voltage.

How does internal resistance affect the voltage and current in a circuit?

• It causes an increase in voltage and a decrease in current flow.

• It causes a drop in voltage and an increase in current flow.

• It has no effect on voltage or current in a circuit.

• It causes a drop in voltage and a decrease in current flow.

Discuss the relationship between internal resistance and power dissipation in a circuit.

• As the internal resistance increases, the power dissipation in the circuit also increases.

• As the internal resistance decreases, the power dissipation in the circuit also decreases.

• Internal resistance has no effect on power dissipation in a circuit.

• Increasing the internal resistance decreases the power dissipation in the circuit.