Ohm's Law

What is the resistor value in the given circuit?

A 200 omega.gif

B 1 komega.gif

C 2 komega.gif

D 4 komega.gif

If the voltage in the given circuit was cut in half, what would the current equal?

A 10 mA

B 30 mA

C 60 mA

D 90 mA

Q3: If voltage across a resistance doubles

A the current is halved

B the resistance doubles

C the current is unchanged

D none of the above

Q4: What electromotive force would cause 20 A of current to flow through a 500 omega.gif resistor?

A 0.04 V

B 2.5 V

C 25.0 V

D 10,000 V

Q5: If the voltage across a fixed value of resistance is increased five times, what does the current do?

A It increases by a factor of five.

B It decreases by a factor of five.

C It stays the same.

D Not enough information

Q6: Power supplies differ from batteries in that

A power supply output voltages are ac and not dc

B power supply voltages are not stable

C power supplies are low-current devices

D None of the above

Q7: A damaged resistor

A may appear burned

B may have an increased resistance value

C may be checked with an ohmmeter

D All of the above

Q8: If the resistance in a circuit with constant voltage increases, the current will

A increase

B decrease

C stay the same

D Not enough information

Q9: Energy is defined as the ability to

A produce heat

B produce light

C All of the above

What is the power in the given circuit?

A 3.92 kW

B 280 W

C 28.6 W

D 9.8 W

What is the power in the given circuit?

A 32 W

B 80 W

C 500 W

D 16 kW

Q12: "Half-splitting" is

A a means for nuclear fuel cells to produce electricity

B a means of isolating a problem in a circuit

C a means for reducing a high ac voltage to a low dc voltage

D a means of limiting current in a circuit

Q13: Power supplies are regulated to prevent the output voltage from changing due to changes in the

A line voltage

B supply load

C frequency

D both line voltage and supply load

Q14: If current through a resistance is halved

A the resistance is halved

B the voltage is halved

C the voltage doubles

D none of the above

Q15: What is the kilowatt-hour consumption of a 40 W lamp if it remains on for 1750 h?

A 43.75

B 70

C 43,750

D 70,000

Q16: Ohm's law describes the mathematical relationship between

A ohms, kilohms, and megohms

B resistor size and resistor value

C resistance, voltage, and current

D none of the above

Q17: The rate at which work is performed is called

A current

B energy

C power

D voltage

What is the power in the given circuit?

A 3.6 W

B 35 W

C 175 W

D 245 W

Q19: If doubling the voltage across a resistor doubles the current through the resistor then

A the resistor value decreased

B the resistor value did not change

C the resistor value increased

D it is impossible to determine the change in the resistor value

Q20: Ohm's law is a relationship between

A voltage, current, and time

B power, current, and resistance

C resistance, time, and current

D voltage, current, and resistance

Q21: A battery's capacity to deliver power is measured in

A kWh

B Ah

C Wh

D Vh

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