Level 1 Unit 3

A circuit has a source voltage of 50V and a current of 10A. What is the power in watts?

• 100

• 250

• 500

• 1500

Voltage is defined as the _____.

• force that causes electrons to flow

• opposition to current flow

• basic unit in which current is measured

• current flowing through a conductor

If a circuit has 12 amps of current and the resistance is 20 ohms, the applied voltage is _____.

• 120 volts

• 240 volts

• 270 volts

• 380 volts

If two 10-ohm resistors are connected in series, what is the total resistance of these resistors?

• 100 ohms

• 20 ohms

• 5 ohms

• 1 ohm

To make sure the voltage is turned off before touching any terminals, use a(n) _____.

• continuity tester

• ammeter

• ohmmeter

• voltage tester

How many amps are there in the current of a circuit if the voltage source is 140V and the resistance is 2 ohms?

• 12 amps

• 70 amps

• 160 amps

• 280 amps

Materials with electrical characteristics that fall between those of insulators and conductors are considered _____.

• charged

• magnetic

• semiconductors

• stable

What is the applied voltage if the current in a circuit is 60 amps and the resistance is 10 ohms?

• 6 volts

• 60 volts

• 600 volts

• 6,000 volts

Which of the following is used to step voltage down to lower levels before it reaches a home or office?

• Transformer

• Generator

• Conductor

• Insulator

A 5-ohm and a 20-ohm resistor are connected in parallel. What is the total resistance of these two resistors?

• 100 ohms

• 25 ohms

• 4 ohms

• 2 ohms