Introduction To Current Electricity Question Preview (ID: 50503)


Introduction To Current And Resistance. TEACHERS: click here for quick copy question ID numbers.

Compared to insulators, metals are better conductors of electricity because metals contain more free
a) protons
b) positive ions
c) electrons
d) negative ions

If 10 C of charge passes a given point in a conductor every 2 seconds, the current at that point is
a) 0.2A
b) 10A
c) 5A
d) 20A

An ampere can be defined as one
a) coulomb per second
b) joule per coulomb
c) ohm per volt
d) Newton per coulomb

One coulomb per second is equal to one
a) watt
b) volt
c) ohm
d) ampere

A wire carries a current of 6A. How much charge passes a point in the wire in 120s?
a) 6C
b) 360C
c) 20C
d) 720C

The resistance of a metallic wire conductor is inversely proportional to its
a) tensile strength
b) length
c) cross sectional area
d) temperature

If the diameter of a wire were decreased, its electrical resistance would
a) increase
b) decrease
c) remain the same
d)

When a light bulb is turned on, its thin wire filament heats up quickly. As the temperature of this wire filament increases, its electrical resistance
a) decreases
b) increases
c) remains the same
d)

If a wire of cross sectional area equal to A has a resistance of R, then another wire of the same material with a cross sectional area equal to 2A will have a resistance of
a) R
b) 2R
c) 0.5R
d) 0.25R

A student needs to increase the resistance in a circuit. All that is available for this task is a wide variety of wires of different lengths and thicknesses. To obtain the maximum resistance, the student should replace the wire with one that is
a) shortest and thickest
b) longest and thickest
c) shortest and thinnest
d) longest and thinnest

As the temperature of a coil of copper wire increases, its electrical resistance
a) increases
b) decreases
c) remains the same
d)

If both the cross-sectional area and the length of a metallic conductor were doubled, the resistance of the conductor would be
a) halved
b) unchanged
c) doubled
d) quadrupled

If the length of a copper wire is reduced by half, then the resistance of the wire will be
a) halved
b) doubled
c) quartered
d) quadrupled

To increase the brightness of a desk lamp, a student replaces a 50W light-bulb with a 100W lightbulb. Compared to the 50W light-bulb, the 100W light-bulb is
a) less resistance and draws more current
b) less resistance and draws less current
c) more resistance and draws more current
d) more resistance and draws less current

An electric circuit consists of a variable resistor connected to a source of constant potential difference. If the resistance of the resistor is doubled, the current through the resistor is
a) doubled
b) quartered
c) quadrupled
d) halved

Which changes would cause the greatest increase in the rate of flow of charge through a conducting wire?
a) increasing the applied potential difference and decreasing the length of the wire
b) increasing the applied potential difference and increasing the length of the wire
c) decreasing the applied potential difference and increasing the length of the wire
d) decreasing the applied potential difference and decreasing the length of the wire

Copper is a metal commonly used for electrical wiring in houses. Which metal conducts electricity better than copper at 20C?
a) aluminum
b) gold
c) nichrome
d) silver

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