What is the conventional current in a wire in a circuit?

Potential is best described as:

A steady current of 2.0 A flows in a wire. How many electrons per second does this represent?

What is the emf of an electrical cell if 625 J of energy is carried by 500 C?

A 2.0 kW heater radiates out heat energy to warm a room. How much energy per minute is this?

In the voltmeter below, if the reading for V₂ is 7.0 V, what would be the reading for V₁?

In the ammeter below, if the readings for A₁ and A₂ are 250 mA and 100 mA respectively, what is the reading for A₃?

A 12 V torch battery supplies a current of 0.50 A for 20 minutes. What is the quantity of charge delivered to the torch globe during that time?

A battery rated at 6.0 V delivers a current of 200 mA to a small light globe. How much electrical energy does the globe transfer into light and heat per second?

A 240 V bed light is rated at 40 W. In kilojoules, how much energy does the light use in 40 minutes?

A 240 V electric oven is rated at 3600 W. It is used to cook a roast dinner, which takes 1.5 hours. How much energy is used (in kWh)?

A light globe with a resistance of 37 $\Omega$   is connected across a battery and turned on for 6.2 minutes. The potential difference across the terminals of the battery is measured as 8.7 V. How many electrons pass through the globe? The charge on an electron = 1.602 × 10–19 C.

A 5.0 mA current flows through a 20 k $\Omega$  resistor, which is placed in series with a battery and a diode. The current in the diode and the potential difference across it is shown in the graph below.