Electrical Power and Circuits

What is the formula used to calculate the power of an electrical device?

• P = U + I

• P = U \ I

• P = \ U

• P = U - I

What is the unit of power in electrical systems?

• Joule (J)

• Ampere (A)

• Watt (W)

• Volt (V)

If a device has a power rating of 100 W, how much energy does it use in one second?

• 100 Joules

• 1000 Joules

• 10 Joules

• 1 Joule

In a series circuit, how does the current behave?

• It varies at each component

• It is equally strong throughout

• It is zero

• It increases with each component

In a parallel circuit, what happens to the voltage across each bulb?

• It is divided among the bulbs

• It is the same as the source voltage

• It is zero

• It varies with the current

What happens if one bulb burns out in a parallel circuit?

• All bulbs go out

• The other bulbs keep working

• The circuit becomes open

• The voltage increases

How can you measure the voltage of a voltage source?

• Using an ammeter

• Using a voltmeter

• Using a multimeter

• Using a resistor

What is the relationship between electrical voltage and the tension of an inflated balloon?

• Higher voltage means lower tension

• Higher voltage means higher tension

• Voltage and tension are unrelated

• Voltage is always constant

What is a capacitor used for in an electrical circuit?

• To provide constant voltage

• To store charge

• To measure current

• To increase resistance

What happens when you connect batteries in series properly?

• Their voltages are subtracted

• Their voltages are added together

• Their currents are added together

• They become insulators