REVIEW QUIZ BEE

REVIEW QUIZ BEE

By Aileen Andaya

Multiple Choice

A 0.5 watt resistor can bear how many amps when connected to 12 volt source:​

• 0.5 amps

• 0.009 amps

• 0.04 amps

• 6 amps

A 0.5 watt resistor can bear how many amps when connected to 12 volt source:​

​

I = P/V

= 0.5 W/12V

= 0.04A​

Multiple Choice

SI unit of power is:

• j

• kW

• W

• J/s

Multiple Choice

What is another term for electromotive force (EMF)?

• AMPERAGE

• OHMAGE

• VOLTAGE

• WATTAGE

Multiple Choice

The electric pressure that drives the electric charge to move in a circuit.

• power

• voltage

• resistance

• current

Multiple Choice

Current flowing through a 10 ohms resistor when subject to 12 volts is:

• 0.83 A

• 1 A

• 1.2 A

• 120 A

Current flowing through a 10 ohms resistor when subject to 12 volts is:

​

I = V/R

= 12 V/10 ohms

= 1.2 A​

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Multiple Choice

The wattage rating of resistor which takes 2 Amps of current when a voltage sources of 230 volts is applied to it:

• 115 watts

• 230 watts

• 460 watts

• 1000 watts

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The wattage rating of resistor which takes 2 Amps of current when a voltage sources of 230 volts is applied to it:​

P = VI

= 230V(2A)

=460 W​

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Multiple Choice

The resistance of 3 m aluminum wire having an area of 2 x 10^-6 m² is: $$\rho$$  = 2.65 x10^-8 ohm meter

• 0.04 ohms

• 0.03 ohms

• 0.09 ohms

• 0.07 ohms

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Multiple Choice

Conventional current flow theory states that current flows from the most positive point to the most

_______________.

• positive

• negative

Multiple Choice

Which of the following changes would increase electrical resistance?

• using a shorter wire

• using a thinner wire

• using a thicker wire

• using wire of lower resistivity

• decreasing the temperature of the wire

Multiple Choice

ohms law describe the mathematical relationship with

• resistor size and resistor value

• ohms, kilohms, and megohms

• resistance, voltage, and current

Multiple Choice

Ohm's law states that

• VI² = R

• I = V/R

• V/I = R²

• I = V²/R

Multiple Choice

If the resistance of an electric bulb is 500 Ω and voltage across its ends is 250 V then power consumed by it is

• 130W

• 125W

• 120W

• 200W

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If the resistance of an electric bulb is 500 Ω and the voltage across its ends is 250 V then power consumed by it is​

P = V² / R

= (250V)² / 500 ​Ω

= 125 W​

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Multiple Choice

How many kilowatts are in 6500 W

• 0.65 kW

• 65 kW

• 6.5 kW

• 6,500,000 kW

Multiple Choice

What is the electrical energy of a 750 W waffle iron that is used for 15 min

• 11,250 kWh

• 0.1875kWh

• 11.25 kWh

• 50 kWh

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What is the electrical energy of a 750 W waffle iron that is used for 15 min​.

P = 750W to 0.75kW

t = 15 min to 0.25 hr

E = PT

= (0.75kW)(0.25h)

= 0.1875kWh​

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Multiple Choice

What is the power rating of an oven that uses 4 kWh of energy in 2 hours?

• 0.5 kW

• 6 kW

• 8 kW

• 2 kW

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What is the power rating of an oven that uses 4 kWh of energy in 2 hours?​

P = E/t

= 4kWh/2h

= 2 kW​

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