The intensity of light incident on a light-dependent resistor (LDR) is increased. The temperature of a thermistor is increased. In each case, the current in the component is maintained at a constant value. What happens to the potential difference across each component?

LDR decreases; thermistor decreases

LDR increases; thermistors increases

LDR increases; thermistor decreases

LDR decreases; thermistor increases

What is the definition of potential difference?

Product of current and resistance

Product of electric field strength and distance

Which ratio has the same units as electromotive force (e.m.f.)?

energy transferred per unit charge

charge per unit energy transferred

energy transferred per unit time

The potential difference (p.d.) across a filament lamp is increased. Which statement is correct?

The resistance of the lamp increases because the temperature increase

The resistance of the lamp decreases because the temperature decreases

The resistance of the lamp decreases because the temperature increases

The resistance of the lamp increases because the temperature decreases

The diagram shows a battery, a fixed resistor, an ammeter and a variable resistor connected in series. The resistance of the variable resistor is reduced. Which option describes the changes in the readings of the ammeter and of the voltmeter? A voltmeter is connected across the fixed resistor.

Ammeter: Increase Voltmeter: Increase

Ammeter: Decrease Voltmeter: Increase

Ammeter: Increase Voltmeter: Decrease

Three identical filament lamps, P, Q, and R, are connected to a battery of negligible internal resistance, as shown. The filament wire in lamp Q breaks so that it no longer conducts. What are the changes in brightness of lamps P and R?

Lamp P: brighter; Lamp R: dimmer

Lamp P: brighter; Lamp R: brighter

Lamp P: dimmer; Lamp R: brighter

Which ratio has the same units as electromotive force (e.m.f.)?

energy transferred per unit charge

charge per unit energy transferred

energy transferred per unit time

The diagram shows a simple circuit. Which statement is correct?

When switch S is closed, the potential difference across the battery falls because work is done against the internal resistance of the battery.

When switch S is closed, the e.m.f. of the battery falls because work is done against the internal resistance of the battery.

When switch S is closed, the e.m.f. of the battery falls because work is done against the resistance of R.

When switch S is closed, the potential difference across the battery falls because work is done against the resistance of R.

AS Physics S2 Electricity v2

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Physics

11th Grade

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MULTIPLE CHOICE QUESTION

2 mins • 1 pt

A circuit consists of a battery, a voltmeter and five fixed resistors, as shown. The voltmeter reading is zero. What is the resistance of resistor R?

1.1 Ohms

2.1 Ohms

4.0 Ohms

8.0 Ohms

MULTIPLE CHOICE QUESTION

2 mins • 1 pt

The sum of the currents entering a junction in an electrical circuit is always equal to the sum of the currents leaving the junction.

It is a consequence of the conservation of charge.

It is a consequence of the conservation of electromotive force.

It is a consequence of the conservation of energy.

It is a consequence of the conservation of potential difference.

MULTIPLE CHOICE QUESTION

2 mins • 1 pt

None

P/Wd

Wv/P

Wd/P

Pv/W

MULTIPLE CHOICE QUESTION

2 mins • 1 pt

A known tensile force acts on a metal wire. The wire does not exceed its limit of proportionality. Which two measurements enable the strain of the wire to be calculated?

The unstretched length of the wire and the cross-sectional area of the wire

the unstretch length of the wire and the extension of the wire

the young modulus of the metal and unstretched lenght if the wire

MULTIPLE CHOICE QUESTION

2 mins • 1 pt

A wire has a resistance of 30 W. A second wire is made from the same material, has the same mass and is three times as long as the first wire. What is the resistance of the second wire?

10ohms

30ohms

90ohms

270ohm

MULTIPLE CHOICE QUESTION

2 mins • 1 pt

What is the definition of the potential difference (p.d.) across a component?

the electrical power supplied to the component

the energy transferred to the component per unit charge

the product of the current in the component and its resistance

the voltage across the component

MULTIPLE CHOICE QUESTION

2 mins • 1 pt

A cell with constant electromotive force (e.m.f.) is connected across a fixed resistor. Over time, the internal resistance of the cell increases. Which change occurs as the internal resistance of the cell increases?

a decrease in the charge of each charge carrier

a decrease in the potential difference measured across the cell

an increase in the energy dissipated per unit time in the fixed resistor

an increase in the number of charge carriers leaving the cell per unit time

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AS Physics S2 Electricity v2

A circuit consists of a battery, a voltmeter and five fixed resistors, as shown. The voltmeter reading is zero. What is the resistance of resistor R?

The sum of the currents entering a junction in an electrical circuit is always equal to the sum of the currents leaving the junction.

None

A known tensile force acts on a metal wire. The wire does not exceed its limit of proportionality. Which two measurements enable the strain of the wire to be calculated?

A wire has a resistance of 30 W. A second wire is made from the same material, has the same mass and is three times as long as the first wire. What is the resistance of the second wire?

What is the definition of the potential difference (p.d.) across a component?

A cell with constant electromotive force (e.m.f.) is connected across a fixed resistor. Over time, the internal resistance of the cell increases. Which change occurs as the internal resistance of the cell increases?

The intensity of light incident on a light-dependent resistor (LDR) is increased. The temperature of a thermistor is increased. In each case, the current in the component is maintained at a constant value. What happens to the potential difference across each component?

An iron wire has length 8.0 m and diameter 0.50 mm. The wire has resistance R. A second iron wire has length 2.0 m and diameter 1.0 mm. What is the resistance of the second wire?

A resistor has resistance R. When the potential difference (p.d.) across the resistor is V, the current in the resistor is I. The power dissipated in the resistor is P. Work W is done when charge Q flows through the resistor. What is not a valid relationship between these variables?

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