Electricity

What happens to a neutral electroscope when a negatively charged rod is touched to its metal knob?

Which property allows metals to be good conductors?

If you increase the amount of charge on two objects, what happens to the electrostatic force between them?

What is the name of the phenomenon where charges rearrange themselves in a neutral conductor when a charged object is nearby?

Which of the following would NOT help to reduce the risk of static discharge when working with sensitive electronic components?

Two positively charged objects are placed near each other. If the charge on one of them is tripled, the repulsive force between them will:

When a cloud becomes charged during a thunderstorm, the bottom of the cloud is often negatively charged. What charge is induced on the ground directly below the cloud?

Which physical law states that the total electric charge in an isolated system remains constant?

A balloon is rubbed against a sweater and then sticks to a wall. This is because the balloon:

Which of the following is true regarding the electrostatic potential energy of a system of two like charges?

If the current in a circuit is $2$ Amperes, how much charge passes a point in $10$ seconds?

What is the symbol for an ammeter in a circuit diagram?

If a circuit is 'open', what does this mean for the current flow?

Which of the following materials would be best to use as the handle of a soldering iron to prevent electric shock?

Which quantity is conserved at a junction in an electric circuit according to Kirchhoff's laws?

Two identical $4 \Omega$ resistors are connected in series, and then that combination is connected in parallel with another $8 \Omega$ resistor. What is the total resistance?

If $1200 J$ of energy is used by a device in $2$ minutes, and the current is $2 A$, what is the potential difference?

A component shows a decrease in resistance as the light intensity hitting it increases. This component is a:

What is the equivalent resistance between points X and Y if three $10 \Omega$ resistors are connected in a 'delta' (triangle) configuration and we measure across any two vertices?

A $60 W$ bulb and a $100 W$ bulb are connected in parallel to a $220 V$ source. Which bulb has a higher resistance?

How is a voltmeter connected to measure the voltage across a resistor?

Which of these is the correct symbol for an Ammeter?

What happens to the total current in a parallel circuit when more branches are added?

In a series circuit, what happens to the brightness of lamps as more lamps are added to the loop?

A $3\ A$ fuse is used in a circuit. What is the maximum number of $100\ W$ bulbs that can be connected in parallel to a $240\ V$ supply before the fuse blows?

Which of the following materials would be best to use as a resistor in a circuit designed to generate heat?

In a simple series circuit with one battery and one bulb, what happens to the current if a second identical battery is added in series (pointing the same direction)?

Two resistors, $R_1$ and $R_2$, are connected in parallel to a battery. $R_1$ has twice the resistance of $R_2$. What is the ratio of the energy dissipated in $R_1$ to $R_2$ in a given time?

A circuit contains two identical resistors in series. When the voltage is $V$, the current is $I$. If the resistors are then connected in parallel and the voltage is doubled to $2V$, what is the new current?

A $12\ V$ source is connected to a series combination of a $2\ \Omega$ resistor and a parallel pair of $4\ \Omega$ resistors. What is the total current?

What is the name of the law that relates voltage, current, and resistance?

If you have a circuit with a $9V$ battery and want a current of $0.5A$, what size resistor should you use?

What effect does increasing the length of a wire usually have on its electrical resistance?

Which of these units is equivalent to one Volt?

A current of $0.6\ A$ flows through a resistor when the potential difference is $12\ V$. What is the resistance?

Which of the following formulas is used to calculate current when voltage and resistance are known?

A potential difference of $5\ V$ is applied to a resistor, and $2\ A$ of current is measured. If $10\ V$ is applied to the same resistor, what current will be measured?

An electric heater is labeled $110 V, 1000 W$. If it is accidentally connected to a $220 V$ source, what would be its power consumption, assuming its resistance does not change?

Two wires of the same length and material are connected in series. Wire A has a diameter of $1 mm$ and Wire B has a diameter of $2 mm$. What is the ratio of the potential difference across Wire A to Wire B?

A galvanometer can be converted into a voltmeter by connecting which of the following?

What does a voltmeter measure when connected across a component?

Which of the following is true for resistors in parallel?

What is the function of a switch in a circuit?

If a circuit has a voltage of $12\,V$ and a resistance of $4\,\Omega$, what is the current?

When a magnet is pushed into a solenoid, a sensitive galvanometer shows a deflection. If the magnet is held stationary inside the solenoid, the galvanometer will:

What is the effect of increasing the speed of rotation of a coil in an AC generator?

How does the work done on a charge ($W$) relate to the potential difference ($V$) and the charge ($Q$)?

An electron is moving north in a region where the magnetic field is directed vertically upwards. In which direction is the electron deflected?

A long straight wire carries a current of $5A$. What is the magnetic field strength at a distance of $10cm$ from the wire? (Use $\mu_0 = 4\pi \times 10^{-7} Tm/A$)

Which of the following is the correct expression for the magnetic force on a wire of length $L$ carrying current $I$ at an angle $\theta$ to a magnetic field $B$?