BMST Electrical Circuits and Ohm's Law 3

Question 1

What does a voltmeter measure in a circuit?

Accepted Answer

Potential difference across a component

Answer

A voltmeter measures the potential difference (voltage) across two points in a circuit.

Question 2

How is an ammeter correctly connected in a circuit?

Accepted Answer

In series with the component

Answer

An ammeter must be connected in series so all current flows through it for accurate measurement.

Question 3

A circuit has two resistors (10 Ω and 40 Ω) in parallel connected to a 20 V source. What current flows through the 10 Ω resistor?

Accepted Answer

2 A

Answer

Voltage is the same across parallel components, so I = V/R = 20/10 = 2 A.

Question 4

What is the unit of electrical power?

Accepted Answer

Watt

Answer

Electrical power is measured in watts (W), where 1 W = 1 joule per second.

Question 5

Which statement best describes Kirchhoff's Current Law (KCL)?

Accepted Answer

Current entering a node equals current leaving it

Answer

KCL states that the total current entering a junction equals the total current leaving it.

BMST - Basic Math and Science Test Practice Test